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Northeast cuts power plant polluting allowances

Less carbon dioxide is polluting the air in the Northeast, prompting state environmental officials to cut allowances for emissions in one of only two cap-and-trade programs in the United States. Full story

Trapping Carbon Dioxide Underground: Can We Do It?

In a policy address last week, President Barack Obama made the reduction of greenhouse gas emissions in the United States a key priority in the nation's fight against climate change. Now, a newly released geological report points to a promising way to cut down on the amount of harmful carbon dioxide Full story

Obama’s record on climate change

"It's been a little disappointing over the last term and a half," Philippe Cousteau said of the president's environmental record to date. "There's been a lot of talk, but not a lot of concrete action." Full story

President Unveils Climate Plan

   President Obama wants to limit carbon emissions, and is hoping to double electric capacity on Federal lands, reports CNBC's Eamon Javers.

Claw-like marks on Mars may be from dry ice

   Researchers believe that chunks of dry ice created during seasonal thaws on Mars may make the hillside grooves NASA calls linear gullies. NBCNews.com's Dara Brown reports.

Some Mars Gullies May Be Carved by Dry Ice 'Sleds'

Some gullies scoring the sides of Martian sand dunes were likely carved by frozen chunks of carbon dioxide, also known as dry ice, a new study finds. Full story

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NASA Checks Tundra for Greenhouse Gases

What Ancient Roman Concrete Could Teach Modern Builders

Carbon Dioxide Greening Deserts

Dry ice likely led to evacuation at California's Disneyland

Carbon dioxide level crosses milestone at Hawaii site

Atmospheric Carbon Dioxide Breaks 3-Million-Year Record

Ice-Free Arctic May Be Near, Study Suggests

Greenhouse Gas to Reach 3-Million-Year High

Ancient Snail Shells Hint at Future Global Warming

Want to Slow Sea Level Rise? Curb 4 Pollutants

Video

  Climate Changer: CO2 & the Environment

William Happer, Princeton University professor, argues that rising carbon dioxide emissions are weakly linked to global warming and could actually increase agricultural productivity.

  Scientists issue dire warning about global warming

The amount of carbon dioxide in the atmosphere has surpassed a threshold that scientists say signals we are running out of time to reverse the impact of global warming. NBC’s Anne Thompson reports.

  More carbon dioxide in air than ever before

In his “Now We Know” segment, Chris Hayes notes that there was a particularly dramatic upward spike in carbon dioxide in just the last year.

  LA traffic ranks second in nation

The new Urban Mobility Report, released Tuesday, ranks Los Angeles second behind Washington DC for the worst traffic. The study took into account both time and money wasted, as well as carbon emissions.

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Related Photos

Red Bull Formula One driver Vettel sits in his car as he is cooled with dry ice during the third practice session of the Bahrain F1 Grand Prix at the Sakhir circuit
Red Bull Formula One driver Vettel sits in his car as he is cooled with dry ice during the third practice session of the Bahrain F1 Grand Prix at the Sakhir circuit

Red Bull Formula One driver Sebastian Vettel of Germany sits in his car as he is cooled with dry ice during the third practice session of the Bahrain F1 Grand Prix at the Sakhir circuit, south of Manama April 20, 2013. REUTERS/Ahmed Jadallah (BAHRAIN - Tags: SPORT MOTORSPORT F1)