https://www.biologicaldiversity.org/programs/biodiversity/elements_of_biodiversity/extinction_crisis/

Although extinction is a natural phenomenon, it occurs at a natural “background” rate of about one to five species per year. Scientists estimate we're now losing ...

http://wwf.panda.org/our_work/biodiversity/biodiversity/

It's a big complex world and we discover new species to science all the time. ... This simply means the rate of species extinctions that would occur if we humans ...

https://news.nationalgeographic.com/news/2014/05/140529-conservation-science-animals-species-endangered-extinction/

Species today are vanishing at a rate a thousand times higher than before humans existed. But burgeoning technology is giving conservationists new hope.

https://www.earthday.org/2018/05/18/fact-sheet-global-species-decline/

May 18, 2018 ... The world is facing a mass extinction of species. All species of mammals, birds, reptiles, amphibians, arthropods (insects and arachnids), fish, ...

https://www.mnn.com/earth-matters/wilderness-resources/blogs/11-startling-stats-about-earths-disappearing-wildlife

Oct 30, 2018 ... Earth is most likely experiencing its sixth mass extinction. ... "Inch by inch and species by species, shrinking wildlife numbers and wild places ...

https://www.theguardian.com/environment/2018/oct/30/humanity-wiped-out-animals-since-1970-major-report-finds

Oct 29, 2018 ... Note: shaded areas show the statistical uncertainty surrounding the ... sixth mass extinction, the first to be caused by a species – Homo sapiens.

https://e360.yale.edu/features/global_extinction_rates_why_do_estimates_vary_so_wildly

Aug 17, 2015 ... Prominent scientists cite dramatically different numbers when estimating the rate at which species are going extinct. Why is that? By Fred ...

https://awionline.org/content/endangered-species

“Threatened” species, under the ESA, are species that are likely to become endangered, and “endangered” species are those that are “in danger of extinction ...

https://www.pbs.org/wgbh/evolution/extinction/massext/statement_03.html

Of all species that have existed on Earth, 99.9 percent are now extinct. Many of them perished in five cataclysmic events. According to a recent poll, seven out of  ...

https://www.worldwildlife.org/pages/living-planet-report-2016

And we're seeing the largest drop in freshwater species: on average, there's been a whopping 81% decline in that time period. - 38 %. The terrestrial LPI shows ...