Solar storms from the sun send charged particles streaming towards Mars. Research now shows those particles are stripping away the atmosphere. NASA/GSFC hide caption

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The Two-Way

Researchers Reveal How Climate Change Killed Mars

Mars used to be much warmer and wetter than it is today. Scientists are unraveling the mystery of why it dried out.

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Elizeu Berçacola, a leader of a group of rubber tappers in Machadinho d'Oeste in the Brazilian state of Rondonia, just after burring down three illegal logging camps. There is a war over the future of the Amazon rainforest in Brazil: those that are fighting it call it 'the war over wood.' Kainaz Amaria/NPR hide caption

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A field near harvest time at Meyers Farm in Bethel, Alaska, can now grow crops like cabbage outside in the ground, due to rising temperatures. Daysha Eaton/KYUK hide caption

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Zach Whitener, research associate at the Gulf of Maine Research Institute, holds a cod while collecting samples for a study. Gulf of Maine Research Institute hide caption

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Imagine a bar without the booze. Delegates wrangling in Bonn, Germany, this week have to figure out soon how to cover the world's climate bill. Oliver Berg/DPA/Landov hide caption

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Bull trout are running out of time in Montana as their traditional waters heat up, biologists say. By moving more than 100 fish to higher elevations, fisheries scientists hope to save the species by seeding a new population in waters that will stay cooler longer. Jim Mogen/USFWS hide caption

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New Mexico's largest electric provider — the coal-fired San Juan Generating Station near Farmington — has been defending a plan to replace part of an aging coal-fired power plant with a mix of more coal, natural gas, nuclear and solar power. Susan Montoya Bryan/AP hide caption

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India's capital is among the most polluted cities in the world, thanks in large part to the growing number of vehicles on its roads. In its just-announced climate change plan, India does not commit to an absolute reduction of its emissions. Instead, it will slow the release of greenhouse gases. DIBYANGSHU SARKAR/AFP/Getty Images hide caption

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Using an instrument they've named the HOLODEC, for Holographic Detector for Clouds, scientists can now see in fine detail the way air and water droplets mix at a cloud's wispiest edge. iStockphoto hide caption

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"I think there's a move that needs to be made toward accelerating what's already inevitable, which is a clean-energy transition that'll create jobs, safeguard our environment and reduce our dependence on foreign oil," Jay Faison told NPR. Courtesy ClearPath hide caption

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Rep. Paul Gosar, R-Ariz., who is Catholic, says he will boycott Pope Francis' address to Congress this week because of the pope's progressive views on climate change. Matt York/AP hide caption

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In this August 2015 file photo, plants burned in the Rocky Fire are shown near Lower Lake, Calif. NPR's environment and climate change reporting encompasses related topics such as wildfires, drought, and other natural disasters. Jeff Chiu/AP hide caption

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A wind farm in Montezuma Hills, about 40 miles northeast of San Francisco. California is considering proposals to, among other things, derive half the state's electricity from renewable sources. Carl Costas/CALmatters hide caption

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