Environmentalist Quotes and aphorisms about know John Muir Greta Thunburg Greta Thunburg ,, The climate crisis is both the easiest and the hardest issue we have ever faced. The easiest becaus... Greta Thunburg Greta Thunburg Paul Hawken Paul Hawken Paul Hawken ,, I doubt very much that the chief executives of any of the Fortune 500 corporations can name five ed... Paul Hawken David R. Brower