For the past dozen years or so, every time the United Nations General Assembly holds its annual session in New York City, climate activists hit Manhattan to protest outside. They call it Climate Week. And this week has been a big one, with tens of thousands of protesters demonstrating as part of the New York March to End Fossil Fuels.

After a summer of extreme weather, Vox’s daily news podcast Today, Explained is tackling Climate Week with some help from a scientist — one who’s been at the center of climate science since before it was cool, and has some ideas on how we can keep the planet from getting too hot.

Michael Mann is a professor at the University of Pennsylvania and author of the new book Our Fragile Moment: How Lessons from Earth’s Past Can Help Us Survive the Climate Crisis. Mann is perhaps best known for the “hockey stick curve” in a 1998 paper he […]