There Was A Time When CO2 Threatened To Be Too Low

The climate is a sensitive balancing act. There are a lot of knobs turning, making the future difficult to model. But trees have done a surprisingly good job adapting quickly to keep atmospheric carbon dioxide in a 'sweet' spot for plant life. As most people know, the cycles of the past have shown that about 90,000 of every 100,000 years have been ice ages. And it's been 12,000 years since the last one. But a biological mechanism could explain how the Earth's atmospheric carbon dioxide and climate were stabilized over the past 24 million years, so things never got too drastic. read more

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