Carson started her career as a biologist in the U.S. Bureau of Fisheries, and became a full-time nature writer in the 1950s. Her widely praised 1951 bestseller The Sea Around Us won her financial security and recognition as a gifted writer. Her next book, The Edge of the Sea, and the republished version of her first book, Under the Sea-Wind, were also bestsellers. Together, her sea trilogy explores the whole of ocean life, from the shores to the surface to the deep sea.
In the late 1950s, Carson turned her attention to conservation and the environmental problems caused by synthetic pesticides. The result was Silent Spring (1962), which brought environmental concerns to an unprecedented portion of the American public. Silent Spring spurred a reversal in national pesticide policy—leading to a nationwide ban on DDT and other pesticides—and the grassroots environmental movement it inspired the creation of the Environmental Protection Agency. Carson was posthumously awarded the Presidential Medal of Freedom.
At the Pennsylvania College for Women (today known as Chatham University), as in high school, Carson was somewhat of a loner. She originally studied English, but switched her major to biology in January 1928, though she continued contributing to the school's student newspaper and literary supplement. Though admitted to graduate standing at Johns Hopkins University in 1928, she was forced to remain at the Pennsylvania College for Women for her senior year due to financial difficulties; she graduated magna cum laude in 1929. After a summer course at the Marine Biological Laboratory, she continued her studies in zoology and genetics at Johns Hopkins in the fall of 1929.
After her first year of graduate school, Carson became a part-time student, taking an assistantship in Raymond Pearl's laboratory, where she worked with rats and Drosophila, to earn money for tuition. After false starts with pit vipers and squirrels, she completed a dissertation project on the embryonic development of the pronephros in fish. She earned a master's degree in zoology in June 1932. She had intended to continue for a doctorate, but in 1934 Carson was forced to leave Johns Hopkins to search for a full-time teaching position to help support her family. In 1935, her father died suddenly, leaving Carson to care for her aging mother and making the financial situation even more critical. At the urging of her undergraduate biology mentor Mary Scott Skinker, she settled for a temporary position with the U.S. Bureau of Fisheries writing radio copy for a series of weekly educational broadcasts entitled "Romance Under the Waters". The series of fifty-two seven-minute programs focused on aquatic life and was intended to generate public interest in fish biology and in the work of the bureau—a task the several writers before Carson had not managed. Carson also began submitting articles on marine life in the Chesapeake Bay, based on her research for the series, to local newspapers and magazines.
Carson's supervisor, pleased with the success of the radio series, asked her to write the introduction to a public brochure about the fisheries bureau; he also worked to secure her the first full-time position that became available. Sitting for the civil service exam, she outscored all other applicants and in 1936 became only the second woman to be hired by the Bureau of Fisheries for a full-time, professional position, as a junior aquatic biologist.
At the U.S. Bureau of Fisheries, Carson's main responsibilities were to analyze and report field data on fish populations, and to write brochures and other literature for the public. Using her research and consultations with marine biologists as starting points, she also wrote a steady stream of articles for The Baltimore Sun and other newspapers. However, her family responsibilities further increased in January 1937 when her older sister died, leaving Carson as the sole breadwinner for her mother and two nieces.
In July 1937, the Atlantic Monthly accepted a revised version of an essay, "The World of Waters", that she had originally written for her first fisheries bureau brochure; her supervisor had deemed it too good for that purpose. The essay, published as "Undersea", was a vivid narrative of a journey along the ocean floor. It marked a major turning point in Carson's writing career. Publishing house Simon & Schuster, impressed by "Undersea", contacted Carson and suggested that she expand it into book form. Several years of writing resulted in Under the Sea-Wind (1941), which received excellent reviews but sold poorly. In the meantime, Carson's article-writing success continued—her features appeared in Sun Magazine, Nature, and Collier's.
Carson attempted to leave the Bureau (by then transformed into the Fish and Wildlife Service) in 1945, but few jobs for naturalists were available as most money for science was focused on technical fields in the wake of the Manhattan Project. In mid-1945, Carson first encountered the subject of DDT, a revolutionary new pesticide (lauded as the "insect bomb" after the atomic bombings of Hiroshima and Nagasaki) that was only beginning to undergo tests for safety and ecological effects. DDT was but one of Carson's many writing interests at the time, and editors found the subject unappealing; she published nothing on DDT until 1962.
Carson rose within the Fish and Wildlife Service, supervising a small writing staff by 1945 and becoming chief editor of publications in 1949. Though her position provided increasing opportunities for fieldwork and freedom in choosing her writing projects, it also entailed increasingly tedious administrative responsibilities. By 1948, Carson was working on material for a second book and had made the conscious decision to begin a transition to writing full-time. That year, she took on a literary agent, Marie Rodell; they formed a close professional relationship that would last the rest of Carson's career.
Oxford University Press expressed interest in Carson's book proposal for a life history of the ocean, spurring her to complete the manuscript of what would become The Sea Around Us by early 1950. Chapters appeared in Science Digest and the Yale Review—the latter chapter, "The Birth of an Island", winning the American Association for the Advancement of Science's George Westinghouse Science Writing Prize—and nine chapters were serialized in The New Yorker. The Sea Around Us remained on the New York Times bestseller list for 86 weeks, was abridged by Reader's Digest, won the 1952 National Book Award and the Burroughs Medal, and resulted in Carson being awarded two honorary doctorates. She also licensed a documentary film to be based on The Sea Around Us. The book's success led to the republication of Under the Sea-Wind, which also became a best-seller. With success came financial security, and Carson was able to give up her job in 1952 to concentrate on writing full time.
Carson was inundated with speaking engagements, fan mail and other correspondence regarding The Sea Around Us, along with work on the documentary script that she had secured the right to review. She was extremely unhappy with the final version of the script by writer, director and producer Irwin Allen; she found it untrue to the atmosphere of the book and scientifically embarrassing, describing it as "a cross between a believe-it-or-not and a breezy travelogue. She discovered, however, that her right to review the script did not extend to any control over its content. Allen proceeded in spite of Carson's objections to produce a very successful documentary. It won the 1953 Oscar for Best Documentary, but Carson was so embittered by the experience that she never again sold film rights to her work.
Carson moved with her mother to Southport Island, Maine in 1953, and in July of that year met Dorothy Freeman (1898–1978)—the beginning of an extremely close relationship that would last the rest of Carson's life. The nature of the relationship between Carson and Freeman has been the subject of much interest and speculation. It is probably best described as a romantic friendship. Carson met Freeman, a summer resident of the island along with her husband, after Freeman had written to Carson to welcome her. Freeman had read The Sea Around Us, a gift from her son, and was excited to have the prominent author as a neighbor. Carson's biographer Linda Lear writes that "Carson sorely needed a devoted friend and kindred spirit who would listen to her without advising and accept her wholly, the writer as well as the woman. She found this in Freeman. The two women had a number of common interests, nature chief among them, and began exchanging letters regularly while apart. They would continue to share every summer for the remainder of Carson's life, and meet whenever else their schedules permitted.
Though Lear does not explicitly describe the relationship as romantic, others (such as the encyclopedia glbtq) have noted that Carson and Freeman knew that their letters could be interpreted as lesbian, even though "the expression of their love was limited almost wholly to letters and very occasional farewell kisses or holding of hands. Freeman shared parts of Carson's letters with her husband to help him understand the relationship, but much of their correspondence was carefully guarded. Shortly before Carson's death, she and Freeman destroyed hundreds of letters. The surviving correspondence was published in 1995 as Always, Rachel: The Letters of Rachel Carson and Dorothy Freeman, 1952–1964: An Intimate Portrait of a Remarkable Friendship, edited by Freeman's granddaughter. According to one reviewer, the pair "fit Carolyn Heilbrun's characterization of a strong female friendship, where what matters is 'not whether friends are homosexual or heterosexual, lovers or not, but whether they share the wonderful energy of work in the public sphere'".
In early 1953 Carson began library and field research on the ecology and organisms of the Atlantic shore. In 1955, she completed the third volume of her sea trilogy, The Edge of the Sea, which focuses on life in coastal ecosystems (particularly along the Eastern Seaboard). It appeared in The New Yorker in two condensed installments shortly before the October 26 book release. By this time, Carson's reputation for clear and poetical prose was well-established; The Edge of the Sea received highly favorable reviews, if not quite as enthusiastic as for The Sea Around Us.
Through 1955 and 1956, Carson worked on a number of projects—including the script for an Omnibus episode, "Something About the Sky"—and wrote articles for popular magazines. Her plan for the next book was to address evolution, but the publication of Julian Huxley's Evolution in Action—and her own difficulty in finding a clear and compelling approach to the topic—led her to abandon the project. Instead, her interests were turning to conservation. She considered an environment-themed book project tentatively entitled Remembrance of the Earth and became involved with The Nature Conservancy and other conservation groups. She also made plans to buy and preserve from development an area in Maine she and Freeman called the "Lost Woods".
Early in 1957, family tragedy struck a third time when one of the nieces she had cared for in the 1940s died at the age of 31, leaving a five-year-old orphan son, Roger Christie. Carson took on that responsibility, adopting the boy, alongside continuing to care for her aging mother; this took a considerable toll on Carson. She moved to Silver Spring, Maryland to care for Roger, and much of 1957 was spent putting their new living situation in order and focusing on specific environmental threats.
By fall 1957, Carson was closely following federal proposals for widespread pesticide spraying; the USDA planned to eradicate fire ants, and other spraying programs involving chlorinated hydrocarbons and organophosphates were on the rise. For the rest of her life, Carson's main professional focus would be the dangers of pesticide overuse.
Starting in the mid-1940s, Carson had become concerned about the use of synthetic pesticides, many of which had been developed through the military funding of science since World War II. It was the USDA's 1957 fire ant eradication program, however, that prompted Carson to devote her research, and her next book, to pesticides and environmental poisons. The fire ant program involved aerial spraying of DDT and other pesticides (mixed with fuel oil), including the spraying of private land. Landowners in Long Island filed a suit to have the spraying stopped, and many in affected regions followed the case closely. Though the suit was lost, the Supreme Court granted petitioners the right to gain injunctions against potential environmental damage in future; this laid the basis for later successful environmental actions.
The Washington, D.C. chapter of the Audubon Society also actively opposed such spraying programs, and recruited Carson to help make public the government's exact spraying practices and the related research. Carson began the four-year project of what would become Silent Spring by gathering examples of environmental damage attributed to DDT. She also attempted to enlist others to join the cause: essayist E. B. White, and a number of journalists and scientists. By 1958, Carson had arranged a book deal, with plans to co-write with Newsweek science journalist Edwin Diamond. However, when The New Yorker commissioned a long and well-paid article on the topic from Carson, she began considering writing more than simply the introduction and conclusion as planned; soon it was a solo project. (Diamond would later write one of the harshest critiques of Silent Spring.)
As her research progressed, Carson found a sizable community of scientists who were documenting the physiological and environmental effects of pesticides. She also took advantage of her personal connections with many government scientists, who supplied her with confidential information. From reading the scientific literature and interviewing scientists, Carson found two scientific camps when it came to pesticides: those who dismissed the possible danger of pesticide spraying barring conclusive proof, and those who were open to the possibility of harm and willing to consider alternative methods such as biological pest control.
By 1959, the USDA's Agricultural Research Service responded to the criticism of Carson and others with a public service film, Fire Ants on Trial; Carson characterized it as "flagrant propaganda" that ignored the dangers that spraying pesticides (especially dieldrin and heptachlor) posed to humans and wildlife. That spring, Carson wrote a letter, published in The Washington Post, that attributed the recent decline in bird populations—in her words, the "silencing of birds"—to pesticide overuse. That was also the year of the "Great Cranberry Scandal": the 1957, 1958, and 1959 crops of U.S. cranberries were found to contain high levels of the herbicide aminotriazole (which caused cancer in laboratory rats) and the sale of all cranberry products was halted. Carson attended the ensuing FDA hearings on revising pesticide regulations; she came away discouraged by the aggressive tactics of the chemical industry representatives, which included expert testimony that was firmly contradicted by the bulk of the scientific literature she had been studying. She also wondered about the possible "financial inducements behind certain pesticide programs".
Research at the Library of Medicine of the National Institutes of Health brought Carson into contact with medical researchers investigating the gamut of cancer-causing chemicals. Of particular significance was the work of National Cancer Institute researcher and founding director of the environmental cancer section Wilhelm Hueper, who classified many pesticides as carcinogens. Carson and her research assistant Jeanne Davis, with the help of NIH librarian Dorothy Algire, found evidence to support the pesticide-cancer connection; to Carson the evidence for the toxicity of a wide array of synthetic pesticides was clear-cut, though such conclusions were very controversial beyond the small community of scientists studying pesticide carcinogenesis.
By 1960, Carson had more than enough research material, and the writing was progressing rapidly. In addition to the thorough literature search, she had investigated hundreds of individual incidents of pesticide exposure and the human sickness and ecological damage that resulted. However, in January, a duodenal ulcer followed by several infections kept her bedridden for weeks, greatly delaying the completion of Silent Spring. As she was nearing full recovery in March (just as she was completing drafts of the two cancer chapters of her book), she discovered cysts in her left breast, one of which necessitated a mastectomy. Though her doctor described the procedure as precautionary and recommended no further treatment, by December Carson discovered that the tumor was in fact malignant and the cancer had metastasized. Her research was also delayed by revision work for a new edition of The Sea Around Us, and by a collaborative photo essay with Erich Hartmann. Most of the research and writing was done by the fall of 1960, except for the discussion of recent research on biological controls and investigations of a handful of new pesticides. However, further health troubles slowed the final revisions in 1961 and early 1962.
It was difficult finding a title for the book; "Silent Spring" was initially suggested as a title for the chapter on birds. By August 1961, Carson finally agreed to the suggestion of her literary agent Marie Rodell: Silent Spring would be a metaphorical title for the entire book—suggesting a bleak future for the whole natural world—rather than a literal chapter title about the absence of birdsong. With Carson's approval, editor Paul Brooks at Houghton Mifflin arranged for illustrations by Louis and Lois Darling, who also designed the cover. The final writing was the first chapter, "A Fable for Tomorrow", which was intended to provide a gentler introduction to what might otherwise be a forbiddingly serious topic. By mid-1962, Brooks and Carson had largely finished the editing, and were laying the groundwork for promoting the book by sending the manuscript out to select individuals for final suggestions.
As biographer Mark Hamilton Lytle writes, Carson "quite self-consciously decided to write a book calling into question the paradigm of scientific progress that defined postwar American culture." The overriding theme of Silent Spring is the powerful—and often negative—effect humans have on the natural world.
Carson's main argument is that pesticides have detrimental effects on the environment; they are more properly termed "biocides", she argues, because their effects are rarely limited to the target pests. DDT is a prime example, but other synthetic pesticides come under scrutiny as well—many of which are subject to bioaccumulation. Carson also accuses the chemical industry of intentionally spreading disinformation and public officials of accepting industry claims uncritically. Most of the book is devoted to pesticides' effects on natural ecosystems, but four chapters also detail cases of human pesticide poisoning, cancer, and other illnesses attributed to pesticides. About DDT and cancer, the subject of so much subsequent debate, Carson says only a little:
In laboratory tests on animal subjects, DDT has produced suspicious liver tumors. Scientists of the Food and Drug Administration who reported the discovery of these tumors were uncertain how to classify them, but felt there was some "justification for considering them low grade hepatic cell carcinomas." Dr. Hueper [author of Occupational Tumors and Allied Diseases] now gives DDT the definite rating of a "chemical carcinogen.
Carson predicts increased consequences in the future, especially as targeted pests develop resistance to pesticides while weakened ecosystems fall prey to unanticipated invasive species. The book closes with a call for a biotic approach to pest control as an alternative to chemical pesticides.
Carson and the others involved with publication of Silent Spring expected fierce criticism. They were particularly concerned about the possibility of being sued for libel. Carson was also undergoing radiation therapy to combat her spreading cancer, and expected to have little energy to devote to defending her work and responding to critics. In preparation for the anticipated attacks, Carson and her agent attempted to amass as many prominent supporters as possible before the book's release.
Most of the book's scientific chapters were reviewed by scientists with relevant expertise, among whom Carson found strong support. Carson attended the White House Conference on Conservation in May, 1962; Houghton Mifflin distributed proof copies of Silent Spring to many of the delegates, and promoted the upcoming New Yorker serialization. Among many others, Carson also sent a proof copy to Supreme Court Justice William O. Douglas, a long-time environmental advocate who had argued against the court's rejection of the Long Island pesticide spraying case (and who had provided Carson with some of the material included in her chapter on herbicides).
Though Silent Spring had generated a fairly high level of interest based on pre-publication promotion, this became much more intense with the serialization in The New Yorker, which began in the June 16, 1962 issue. This brought the book to the attention of the chemical industry and its lobbyists, as well as a wide swath of the American populace. Around that time Carson also learned that Silent Spring had been selected as the Book-of-the-Month for October; as she put it, this would "carry it to farms and hamlets all over that country that don't know what a bookstore looks like—much less The New Yorker. Other publicity included a positive editorial in The New York Times and excerpts of the serialized version in Audubon Magazine, with another round of publicity in July and August as chemical companies responded. The story of the birth defect-causing drug thalidomide broke just before the book's publication as well, inviting comparisons between Carson and Frances Oldham Kelsey, the Food and Drug Administration reviewer who had blocked the drug's sale in the United States.
In the weeks leading up to the September 27 publication there was strong opposition to Silent Spring. DuPont (a main manufacturer of DDT and 2,4-D) and Velsicol Chemical Company (exclusive manufacturer of chlordane and heptachlor) were among the first to respond. DuPont compiled an extensive report on the book's press coverage and estimated impact on public opinion. Velsicol threatened legal action against Houghton Mifflin as well as The New Yorker and Audubon Magazine unless the planned Silent Spring features were canceled. Chemical industry representatives and lobbyists also lodged a range of non-specific complaints, some anonymously. Chemical companies and associated organizations produced a number of their own brochures and articles promoting and defending pesticide use. However, Carson's and the publishers' lawyers were confident in the vetting process Silent Spring had undergone. The magazine and book publications proceeded as planned, as did the large Book-of-the-Month printing (which included a pamphlet endorsing the book by William O. Douglas).
American Cyanamid biochemist Robert White-Stevens and former Cyanamid chemist Thomas Jukes were among the most aggressive critics, especially of Carson's analysis of DDT. According to White-Stevens, "If man were to follow the teachings of Miss Carson, we would return to the Dark Ages, and the insects and diseases and vermin would once again inherit the earth." Others went further, attacking Carson's scientific credentials (because her training was in marine biology rather than biochemistry) and her personal character. White-Stevens labeled her "a fanatic defender of the cult of the balance of nature", while former Secretary of Agriculture Ezra Taft Benson—in a letter to Dwight D. Eisenhower—reportedly concluded that because she was unmarried despite being physically attractive, she was "probably a Communist".
Many critics repeatedly asserted that she was calling for the elimination of all pesticides. Yet Carson had made it clear she was not advocating the banning or complete withdrawal of helpful pesticides, but was instead encouraging responsible and carefully managed use with an awareness of the chemicals' impact on the entire ecosystem. In fact, she concludes her section on DDT in Silent Spring not by urging a total ban, but with advice for spraying as little as possible to limit the development of resistance.
The academic community—including prominent defenders such as H. J. Muller, Loren Eisley, Clarence Cottam, and Frank Egler—by and large backed the book's scientific claims; public opinion soon turned Carson's way as well. The chemical industry campaign backfired, as the controversy greatly increased public awareness of potential pesticide dangers, as well as Silent Spring book sales. Pesticide use became a major public issue, especially after the CBS Reports TV special "The Silent Spring of Rachel Carson" that aired April 3, 1963. The program included segments of Carson reading from Silent Spring and interviews with a number of other experts, mostly critics (including White-Stevens); according to biographer Linda Lear, "in juxtaposition to the wild-eyed, loud-voiced Dr. Robert White-Stevens in white lab coat, Carson appeared anything but the hysterical alarmist that her critics contended. Reactions from the estimated audience of ten to fifteen million were overwhelmingly positive, and the program spurred a congressional review of pesticide dangers and the public release of a pesticide report by the President's Science Advisory Committee. Within a year or so of publication, the attacks on the book and on Carson had largely lost momentum. In one of her last public appearances, Carson had testified before President Kennedy's Science Advisory Committee. The committee issued its report on May 15, 1963, largely backing Carson's scientific claims. Following the report's release, she also testified before a Senate subcommittee to make policy recommendations. Though Carson received hundreds of other speaking invitations, she was unable to accept the great majority of them. Her health was steadily declining as her cancer outpaced the radiation therapy, with only brief periods of remission. She spoke as much as she was physically able, however, including a notable appearance on The Today Show and speeches at several dinners held in her honor. In late 1963, she received a flurry of awards and honors: the Paul Bartsch Award (from the Audubon Naturalist Society), the Audubon Medal (from the American Geographical Society), and induction into the American Academy of Arts and Letters.
Weakened from breast cancer and her treatment regimen, Carson became ill with a respiratory virus in January 1964. Her condition worsened from there: in February, doctors found that she had severe anemia from her radiation treatments, and in March they discovered that the cancer had reached her liver. She died of a heart attack on April 14, 1964, at the age of 56.
Carson bequeathed her manuscripts and papers to Yale University, to take advantage of the new state-of-the-art preservations facilities of the Beinecke Rare Book and Manuscript Library. Her longtime agent and literary executor Marie Rodell spent nearly two years organizing and cataloging Carson's papers and correspondence, distributing all the letters to their senders so that only what each correspondent approved of would be submitted to the archive.
In 1965, Rodell arranged for the publication of an essay Carson had intended to expand into a book: A Sense of Wonder. The essay, which was combined with photographs by Charles Pratt and others, exhorts parents to help their children experience the "lasting pleasures of contact with the natural world", which "are available to anyone who will place himself under the influence of earth, sea and sky and their amazing life."
In addition to the letters in Always Rachel, in 1998 a volume of Carson's previously unpublished work was published as Lost Woods: The Discovered Writing of Rachel Carson, edited by Linda Lear. All of Carson's books remain in print.
Carson's work had a powerful impact on the environmental movement. Silent Spring, in particular, was a rallying point for the fledging social movement in the 1960s. According to environmental engineer and Carson scholar H. Patricia Hynes, "Silent Spring altered the balance of power in the world. No one since would be able to sell pollution as the necessary underside of progress so easily or uncritically. Carson's work, and the activism it inspired, are at least partly responsible for the deep ecology movement, and the overall strength of the grassroots environmental movement since the 1960s. It was also influential on the rise of ecofeminism and on many feminist scientists.
Carson's most direct legacy in the environmental movement was the campaign to ban the use of DDT in the United States (and related efforts to ban or limit its use throughout the world). Though environmental concerns about DDT had been considered by government agencies as early as Carson's testimony before the President's Science Advisory Committee, the 1967 formation of the Environmental Defense Fund was the first major milestone in the campaign against DDT. The organization brought lawsuits against the government to "establish a citizen's right to a clean environment", and the arguments employed against DDT largely mirrored Carson's. By 1972, the Environmental Defense Fund and other activist groups had succeeded in securing a phase-out of DDT use in the United States (except in emergency cases).
The creation, in 1970, of the Environmental Protection Agency addressed another concern that Carson had brought to light. Until then, the same agency (the USDA) was responsible both for regulating pesticides and promoting the concerns of the agriculture industry; Carson saw this as a conflict of interest, since the agency was not responsible for effects on wildlife or other environmental concerns beyond farm policy. Fifteen years after its creation, one journalist described the EPA as "the extended shadow of Silent Spring". Much of the agency's early work, such as enforcement of the 1972 Federal Insecticide, Fungicide, and Rodenticide Act, was directly related to Carson's work.
Carson and the environmental movement were—and continue to be—criticized by some conservatives, who argue that restrictions placed on pesticides have caused needless deaths and hampered agriculture, and more generally that environmental regulation unnecessarily restricts economic freedom. For example, the conservative magazine Human Events gave Silent Spring an honorable mention for the "Ten Most Harmful Books of the 19th and 20th Centuries". In the 1980s, the Reagan administration sought to undo as much of the environmental legacy of the 1960s and 1970s as possible, and Carson and her work were obvious targets.
Carson's attack on DDT has come under the most intense fire. Political scientist Charles Rubin was one of the most vociferous critics in the 1980s and 1990s, though he accused her merely of selective use of source and fanaticism (rather than the more severe criticism Carson received upon Silent Spring's release). In the 2000s, critics have claimed that Carson is responsible for millions of malaria deaths, because of the DDT bans her work prompted. Biographer Mark Hamilton Lytle finds these estimates unrealistic, even assuming that Carson can be "blamed" for worldwide DDT policies, and suggests that malaria is much less significant than a number of other widespread preventable public health problems in Africa. Carson never actually called for an outright ban on DDT.
Some experts have argued that restrictions placed on the agricultural use of DDT have increased its effectiveness as a tool for battling malaria. According to pro-DDT advocate Amir Attaran the result of the 2004 Stockholm Convention banning DDT's use in agriculture "is arguably better than the status quo…For the first time, there is now an insecticide which is restricted to vector control only, meaning that the selection of resistant mosquitoes will be slower than before. But though Carson's legacy has been closely tied to DDT, Roger Bate of the DDT advocacy organization Africa Fighting Malaria warns that "A lot of people have used Carson to push their own agendas. We just have to be a little careful when you're talking about someone who died in 1964.
A variety of groups ranging from government institutions to environmental and conservation organizations to scholarly societies have celebrated Carson's life and work since her death. Perhaps most significantly, on June 9, 1980 Carson was awarded the Presidential Medal of Freedom, the highest civilian honor in the United States, in recognition of her influence on President Kennedy and her foundational role in the environmental movement. A U.S. postage stamp was issued in her honor the following year; several other countries have since issued Carson postage as well.
Carson's birthplace and childhood home in Springdale, Pennsylvania—now known as the Rachel Carson Homestead—became a National Register of Historic Places site, and the nonprofit Rachel Carson Homestead Association was created in 1975 to manage it. Her home in Colesville, Maryland where she wrote Silent Spring was named a National Historic Landmark in 1991 . Near Pittsburgh, a hiking trail, maintained by the Rachel Carson Trails Conservancy, was dedicated to Carson in 1975. A Pittsburgh bridge was also renamed in Carson's honor as the Rachel Carson Bridge. The Pennsylvania Department of Environmental Protection State Office Building in Harrisburg is named in her honor. An elementary school in Gaithersburg, Montgomery County, MD, built in 1990, was named in her honor, as was a middle school in Herndon, VA.
A number of conservation areas have been named for Carson as well. Between 1964 and 1990, near Brookeville in Montgomery County, Maryland were acquired and set aside as the Rachel Carson Conservation Park, administered by the Maryland-National Capital Park and Planning Commission. In 1969, the Coastal Maine National Wildlife Refuge became the Rachel Carson National Wildlife Refuge; expansions will bring the size of the refuge to about . In 1985, North Carolina renamed one of its estuarine reserves in honor of Carson, in Beaufort.
Carson is also a frequent namesake for prizes awarded by philanthropic, educational and scholarly institutions. The Rachel Carson Prize, founded in Stavanger, Norway in 1991, is awarded to women who have made a contribution in the field of environmental protection. The American Society for Environmental History has awarded the Rachel Carson Prize for Best Dissertation since 1993. Since 1998, the Society for Social Studies of Science has awarded an annual Rachel Carson Book Prize for "a book length work of social or political relevance in the area of science and technology studies.
2007 was the centennial of Carson's birth. On Earth Day (April 22, 2007), Courage for the Earth: Writers, Scientists, and Activists Celebrate the Life and Writing of Rachel Carson was released as "a centennial appreciation of Rachel Carson's brave life and transformative writing", thirteen essays by prominent environmental writers and scientists. Democratic Senator Benjamin L. Cardin, Maryland, had intended to submit a resolution celebrating Carson for her "legacy of scientific rigor coupled with poetic sensibility" on the 100th anniversary of her birth. The resolution was blocked by Republican Senator Tom Coburn, Oklahoma, who said that "The junk science and stigma surrounding DDT—the cheapest and most effective insecticide on the planet—have finally been jettisoned. The Rachel Carson Homestead Association held a May 27 birthday party and sustainable feast at her birthplace and home in Springdale, Pennsylvania, and planned several other events throughout the year.