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Denna sidan visar ordspråk som liknar "I'm a student of conservation history and what I see are cycles, ... The trend over time has been a broader level of conservation and concern. But there are peaks and valleys. We had tremendous environmental activism under Theodore Roosevelt, then went through a drought in the '20s. We had another resurgence in conservation interest in the '30s, hit a lull in the '50s, then had a highly active period in the '60s and '70s. We're in one of those down periods again, but I'm as certain as I can be that we're getting to the end of this period and headed toward a new era of conservation and concern.".