What action did john muir take that brought about "green awareness"

The correct answer is:

He advocated for the preservation of wild lands in the United States.

John Muir was an Scottish-American naturalist, philosopher, author, also known as "John of the Mountains" and Father of National Parks. He made the most valuable contribution to the security of the United Stated wild lands, such as Yosemite Valley.

A) he advocated for the preservation of wildlands in the United States. Apex