permafrost

If Earth heats up beyond 1.5 degrees, the impacts don't get just slightly worse--scientists warn that abrupt changes could be set off, with devastating impacts around the world. As the 27th annual climate negotiations are underway in Egypt and the world is set to blow past that 1.5°C warming threshold,
Emily Kwong talks to climate correspondents Rebecca Hersher and Lauren Sommer about three climate tipping points--points of no return that could cause big changes to the Earth's ecosystems.

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Climate change and this year's weather patterns are behind the record-breaking heat in Siberia. NPR Climate Reporter Rebecca Hersher tells us how it's contributed to all sorts of problems there — mosquito swarms, buckling roads, wildfires. And we'll hear how these high temps are threatening the livelihoods of Indigenous Russians.

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The desolate Alaskan tundra - a landscape that has literally been frozen solid for thousands of years - is suddenly caving in on itself. Colonizing beavers are engineering new wetlands that thaw the soil, rapidly releasing greenhouse methane into the atmosphere. Beavers can survive in the arctic because - like people - they change the environment to make homes for themselves, and their carbon footprint can be seen from space. For more information on this episode, visit nationalgeographic.com/overheard Want More? Permafrost covers an area more than twice the size of the United States. Read about why it's thawing faster than we expected. There are drunken trees in forests across Alaska, Canada and northern Eurasia. Check out pictures of some drunken forests. Ben Goldfarb believes that beavers aren't only not to blame for climate change, they're actually helping fight against it. Also explore: Not only is methane a greenhouse gas, it's also flammable. Watch Katey Walter Anthony set frozen lakes on fire. Ever wonder why beavers make such great hats? And why they eventually went out of style? Wonder no more. If you like what you hear and want to support more content like this, please consider a National Geographic subscription. Go to natgeo.com/exploremore to subscribe today.  Learn more about your ad choices. Visit megaphone.fm/adchoices