How the World Passed a Carbon Threshold and Why It Matters

ENN
Jan 30, 2017, 4:11 pm54 pts
Last year will go down in history as the year when the planet’s atmosphere broke a startling record: 400 parts per million of carbon dioxide. The last time the planet’s air was so rich in CO2 was millions of years ago, back before early predecessors to humans were likely wielding stone tools; the world was…

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