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If we want to know how the Earth's biosphere is going to respond to the things that humans are doing to the planet right now, the only evidence that we have is how biotic systems have responded in the past.

"What's The Anthropocene?". "TED Radio Hour" with Guy Raz, www.npr.org. September 30, 2016.
If we want to know how the Earth's biosphere is going to respond to the things that humans are doing to the planet right now, the only evidence that we have is how biotic systems have responded in the past.