Who is a noted American environmentalist and writer?

There are many noted American environmentalists and writers, so it depends on what kind of figure you're looking for. Here are a few examples with different focuses:

For a well-known and influential figure:

* Rachel Carson: Author of "Silent Spring," which exposed the dangers of pesticides and sparked the modern environmental movement.

For a more contemporary figure:

* Bill McKibben: Author, activist, and founder of 350.org, a climate change organization.

For a figure focused on conservation and nature writing:

* Aldo Leopold: Author of "A Sand County Almanac," which explores the ethics of human relationship to the natural world.

For a figure focusing on environmental justice:

* Wangari Maathai: Kenyan environmentalist and Nobel Peace Prize laureate who founded the Green Belt Movement to plant trees and empower women.

For a figure focused on climate change activism:

* Greta Thunberg: Swedish climate activist known for her impassioned speeches and school strikes for climate action.

To give you a more precise answer, please tell me:

* What kind of environmentalism are you interested in?

* What kind of writing do you prefer? (e.g. essays, novels, poetry, etc.)

* Do you have a specific time period in mind?

With more information, I can give you a more specific and relevant answer.