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Sep 24, 2015, 3:15 pm71 pts
Grist
If you spend much time keeping up with the climate, you are bound to come across a number like 400 PPM, or parts per million. Simply put, that’s a measure of the amount of CO2 in the atmosphere. That means, on average, 0.04 percent of our atmosphere consists of carbon dioxide. It may not sound like a lot,…
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