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Since humanity arrived, we have cut down trees for timber, agriculture and development. Our impact is a matter of scale. When humanity was a mere 300 million in pre-medieval times, forest ecosystems remained intact. We are now over 7 billion, doing essentially the same thing we did thousands of years ago. What may have been sustainable then is now extirpating entire complex ecosystems, along with species we may never know existed. Deforestation releases a massive carbon sink into the atmosphere, driving global warming.
