An example of a thesis statement might be, "As the world's population continues to grow, the need for lawmakers to step up to protect fragile ecosystems in order to maintain biological diversity is at an all-time high." A thesis statement is made by taking a specific statement and creating a position that may be opposed or challenged.
A thesis statement will appear in essays, papers and articles. It is not always necessary to approach a thesis statement from an opposing view; it can simply be meant as a way to provide a concise summary for an informational paper. The thesis statement should also be something that can be entirely supported.
There is a simple test that all thesis statements should pass and that can be administered when trying to write a new thesis statement. This is known as the "how and why test." If the reader would read the thesis statement and ask "how" or why" then the thesis statement is most likely not specific enough. Another test is the "so what?" response. If a reader has this response to a thesis, then it is most likely not clear why the essay matters and why the reader should care about the subject matter.