A man walks his dog through farmland in a field near Holzkirchen, in the south of Germany.Michael Dalder / Reuters

This is ‘Not Doomed Yet,’ The Atlantic’s newsletter about global warming. It lives here in the Science section; you can also get it in your inbox:

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Tuesday, November 8, is Election Day in the United States.

If you’re an American, you can use the League of Women Voters’ site to find your polling place. Please make a plan to vote today: Figure out when you’re going to fit it into your day and what local questions are on the ballot.

Then actually go and do it.

If you’re an American reading this newsletter, please consider how you could use the next 18 hours to bring about the outcome you want. Know that there are many subscribers to this newsletter living outside the U.S.—many who are maybe even reading these words right now!—who envy that you get to participate in this thing. This newsletter is all about putting anxiety to good use, so, please: Go do that.

If there was any doubt, know that the Department of Defense and the American Medical Association both believe that global warming could devastate human health, even in the rich world, and upheave the peaceful global order. Only Hillary Clinton’s policies actually address the threat of climate change.

Meanwhile, Donald Trump rejects the existence of climate change, saying it is a fraud or a hoax invented by the Chinese. Because so much global warming is already “baked-in”—and because we face such a delicate moment in global diplomacy, with the Paris Agreement only recently ratified—it’s possible that a Trump presidency could ensure we simply never hit the two-degree Celsius global target and careen toward dangerous, irreversible climate change.

Bill McKibben, one of the leaders of modern American environmentalism, endorses Clinton specifically because she can be pressured on ecological and climate issues.

But if you know all this already, and just want to get onto links, here’s what I wrote this week:

First, while the race for the White House (and Congress) will shape the planet more than other elections, individual states are facing some of the most fascinating fights as they vote on climate-focused ballot questions. I wrote about it!

To wit: Floridians are voting on a deceptively-worded referendum that would make it more expensive to add solar panels to your house, and Washington is deciding whether it should adopt a carbon tax that a left-liberal coalition opposes. If adopted, the revenue-neutral carbon tax would become the most stringent in North America, pricing one ton of carbon at $25 by 2018.

Second—and this is one of the coolest climate studies I’ve ever seentwo researchers have discovered a linear relationship between atmospheric carbon and summer Arctic sea ice. This discovery allows them to definitively say: For every ton of CO₂ emitted, three square meters of summer Arctic sea ice disappears. Which, in turn, means:

The average American is personally responsible for 645 square feet of melted summer Arctic sea ice every year.

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For the week beginning on October 30, 2016, the Mauna Loa observatory measured atmospheric carbon levels of 402.81 parts per million. One year ago, atmospheric CO₂ stood at 398.94 ppm. Ten years ago, when the 12th UN climate-change conference was opening in Nairobi, the observatory recorded carbon dioxide levels of 379.61 ppm.

This week, the 22nd UN conference on climate change begins in Marrakech, Morocco. The nations of the world will celebrate the ratification of the Paris Agreement and discuss how to measure the individual national commitments that signatories to the treaty have made.

Oh, and, hey: The Paris Agreement became international law on Friday.

In U.S. politics,

In global energy news,

This week in the Earth system:

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How do young climate scientists understand their field? I love this series—and specifically this response from Sarah Myrhe, an oceanographer:

Kind of hard. Weird. Complex. Lots of cognitive dissonance. Some existential crisis. I’m not going to lie, it’s a gritty place when you are staring down at data and probabilities for how your favorite places in the world will change during your kid’s life span. Honestly, being a parent has also really changed my approach to my career. Having a kid and seeing how much my parents love my kid has made me feel so connected to people in the future. It’s a hard question because I love my career. I am supremely privileged to get to do the work that I do. But there is a big part of shouldering the knowledge of this global crisis that has been challenging for me. It’s caused me some grief and it’s really forced me to grow up.

This is the headline of the week.

And if you have time, please read my friend Charlie Loyd’s reflection on his grandmother’s life.

Thanks, as always, for reading.

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