WATCH: What Does 400 ppm Mean? Talking with Climate Scientist Michael Mann

Last week in Washington, DC, leading climate scientist Michael Mann of the University of Pennsylvania sat down with Climate Desk Live to talk about the significance of an planetary milestone—we’ve reached 400 parts per million of carbon dioxide in the atmosphere. As Mann explained, humans are altering the content of the atmosphere at an alarming rate—one perhaps never seen before in the history of Earth itself.

More Mother Jones reporting on Climate Desk

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FOLLOW THE MONEY

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And right now, a longtime friend of Mother Jones has pledged an incredibly generous gift to inspire—and double—giving from online readers. That's huge! Because you can see that our fall fundraising drive is well behind the $325,000 we need to raise. So if you agree that in-depth, fiercely independent journalism matters right now, please support our work and help us raise the money it takes to keep Mother Jones charging hard. Your gift, and all online donations up $94,000 total, will be matched and go twice as far—but only until the November 9 deadline.

$400,000 to go: Please help us pick up the pace!

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