which photographer was known for his/her work as an environmentalist? ansel adams dorothea lange annie liebovitz alfred eisenstaedt?
<answer> Ansel Easton Adams was an American photographer known for his work as a environmentalist. <context> Ansel Easton Adams was an American photographer and environmentalist. His black-and-white landscape photographs of the American West, especially Yosemite National Park, have been widely reproduced on calendars, posters, and in books.