The appearance of photosynthesis, trilobites, and the five major mass extinctions were all extreme changes in our planet's pattern of biological production and consumption. But, even measured against these events, human-driven changes to production and consumption are distinctly new.

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The appearance of photosynthesis, trilobites, and the five major mass extinctions were all extreme changes in our planet's pattern of biological production and consumption. But, even measured against these events, human-driven changes to production and consumption are distinctly new.