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400 ppm: A Milestone that Means Everything, and Nothing

Race to Map Africa’s Forgotten Glaciers Before They Melt

Geoengineered Sky: Bye-Bye Blue, Hello White

‘Golden Age of Gas’ Threatens Renewable Energy

Will Our Luck Run Out? Major Hurricane Gap in U.S.

Greenhouse-Gas Emissions Across Globe Hit Record High

A River Runs Through It: Scientists Explain Arctic Mercury

G-8 Leaders Agree to Cut Short-Lived Greenhouse Gases

Image of the Day: Four Degrees of Preparation

Australian Project Simulates Runaway Climate Change

Princeton Senior Exploring Solution of Bamboo as Biofuel

Climate Negotiators Try to Make Headway in Bonn Talks

Globe Records Fifth-Warmest April on Record

New Push to Limit ‘Super Greenhouse’ Gases

House Cuts Funding for Climate Education, Outreach

Tree-Hugging, Organic-Buying Spoof Hits Sunny Spot

Never Stand Behind a Dinosaur, New Research Shows

Image of the Day: Here Comes the Sun—and Energy

Why Groundwater is Another Sea Level Rise Concern

Image of the Day: Koalas Listed as Threatened Species

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Corn Ethanol Energy Sources 8 gallons’ worth of the energy in 10 gallons of corn ethanol comes from fossil fuels.