Opinion: Carbon dioxide levels are higher than humans have ever seen. It’s on us to act - Gainesville Times

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Opinion: Carbon dioxide levels are higher than humans have ever seen. It’s on us to act

This view from the Apollo 11 spacecraft shows the Earth rising above the moon's horizon. Photo from NASA.

0316 ATHEIST 3.jpg — This view from the Apollo 11 spacecraft shows the Earth rising above the moon's horizon. Photo from NASA.

For most of Earth’s human history, carbon dioxide (CO2) levels in the atmosphere have ranged between 180 and 280 parts per million.