Environmentalist Quotes and aphorisms about our John Muir John Muir John Muir Greta Thunburg Greta Thunburg ,, I remember when I was younger, and in school, our teachers showed us films of plastic in the ocean,... Greta Thunburg ,, The climate crisis is both the easiest and the hardest issue we have ever faced. The easiest becaus... Greta Thunburg Greta Thunburg Greta Thunburg Paul Hawken