Atmospheric CO2 is approaching 400 parts per million for the first time in about 15 million years. That’s more than a 40 percent increase since the 19th century. It’s currently increasing at least 10 times faster than during the previous record high, which by strange coincidence was set right before the end-Permian extinction, 250 million years ago.
A mountain of evidence has convinced the overwhelming majority of scientists that our skyrocketing CO2 emissions have very likely caused most of the global warming since 1950. What does this mean for Southern California?

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