Fact #1
CO2

140-million-year trend of dangerously decreasing CO2.

The warming effect of each molecule of CO2 declines as its concentration increases

Fact #3

First and foremost, CO2 is plant food.

Fact #4
CO2

In the last four ice ages, the CO2 level was dangerously low.

Fact #5
CO2

CO2 emissions began accelerating in the mid-20th century

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