Environmentalist Quotes and aphorisms about both Greta Thunburg Greta Thunburg Greta Thunburg ,, The climate crisis is both the easiest and the hardest issue we have ever faced. The easiest becaus... Paul Hawken ,, We need to revise our economic thinking to give full value to our natural resources. This revised e... Joseph Wood Krutch Richard Leakey Donella Meadows Ma Jun Ma Jun Henry Walter Bates