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  Climate Changer: CO2 & the Environment

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.

Project aims to track big city carbon footprints

Every time Los Angeles exhales, odd-looking gadgets anchored in the mountains above the city trace the invisible puffs of carbon dioxide, methane and other greenhouse gases that waft skyward. Full story

Carbon dioxide level crosses milestone at Hawaii site

WASHINGTON (Reuters) - The amount of climate-warming carbon dioxide in the atmosphere topped 400 parts per million at a key observing station in Hawaii for the first time since measurement began in 1958, the National Oceanic and Atmospheric Administration said on Friday. Full story

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Greenhouse gas milestone; CO2 levels set record

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Want to Slow Sea Level Rise? Curb 4 Pollutants

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Washington state lawmaker backpedals after saying cyclists pollute by breathing

Past Antarctic Warming Linked to Greenhouse Gas

Senators propose long-shot carbon tax bill for big polluters

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  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.

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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)