Massive U.N. report says climate risks go beyond red alert

(Photo: Mike McMillan / USFS via Reuters file)

Global warming is driving humanity toward a whole new level of many risks, a U.N. scientific panel reports, warning that the wild climate ride has only just begun.

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(Source: NBCNews.com)

Lights off, shine on: World honors Earth Hour

(Photo: Ina Fassbender / Reuters)

Lights went off in thousands of cities and towns across the world today for the annual Earth Hour event, organized by the World Wildlife Fund. Earth Hour takes place worldwide at 8.30 p.m. local time and is a global call to turn off lights for 60 minutes to raise awareness on a variety of environmental issues.

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(Source: NBCNews.com)

Air pollution kills 7 million a year, WHO says

(Photo: Philippe Wojazer / Reuters)

Air pollution kills 7 million people a year globally, 80 percent of them from heart disease and stroke, the World Health Organization said Monday.

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(Source: NBCNews.com)

Report: Keystone pipeline would have minimal environmental impact

(Photo: Nathan Vanderklippe / Globe & Mail / Reuters)

A new State Department report on the proposed Keystone XL oil pipeline finds that the project would have a minimal impact on the environment, an assessment likely to increase pressure on the White House to approve it. But the report sets no deadline for doing so. 

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(Source: NBCNews.com)

Seahawks, Broncos gear up for super ‘green’ bowl 

(Photo: Eduardo Munoz / Reuters)

Given the legalization of recreational marijuana in Washington and Colorado, this year’s Super Bowl featuring the Seattle Seahawks and Denver Broncos has already earned a few chuckles as the “green” bowl. Pot jokes aside, the annual pigskin revelry has become progressively more environmentally friendly over the past 20 years, according to the National Football League.

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(Source: NBCNews.com)

Disease suspected in Utah die-off of bald eagles

(Photo via NBC Nightly News)

The tally of unexplained bald eagle deaths in Utah this month rose to 20 on Thursday as state wildlife officials looked for possible links to diseases suspected in a coinciding die-off of thousands of shore birds around the Great Salt Lake.

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(Source: NBCNews.com)

'Extremely likely': Humans blamed more clearly than ever for global warming

(Photo: Reuters file)

A group of top climate scientists found in a new report that human beings needs to limit all man-made carbon emissions below a total of 1 trillion tons in order to limit climate change – and noted that the planet had already reached half that amount by 2011.

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(Source: NBCNews.com)

Final verdict expected Friday: Humans caused global warming

An international panel of scientists is expected to issue a report Friday that dismisses nearly every doubt that human activity has caused temperatures to warm, glaciers to melt, and seas to bulge since the middle of last century. 

(Source: NBCNews.com)

Colorado floods triggered by convergence of geography and climate, experts say

(Photo: RJ Sangosti / Denver Post)

The torrent of water that gushed over and down the Rocky Mountains late last week resulted from a fateful confluence of geography and weather. While the deluge is unprecedented in the historic record, it may offer a window onto the new normal as the planet continues to warm.

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(Source: NBCNews.com)

Extreme heat waves to quadruple by 2040, study says

The type of heat waves that wilt crops, torch forests — and kill people — are expected to become more frequent and severe over the next 30 years regardless of whether humans curb emissions of the greenhouse gas carbon dioxide, according to a new study.

(Source: NBCNews.com)

Halliburton admits destroying evidence on Deepwater Horizon disaster

(Photo: Reuters)

Halliburton Energy Services has agreed to plead guilty and pay the maximum fine for destroying evidence in the Deepwater Horizon disaster, the company and the Justice Department said Thursday.

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(Source: NBCNews.com)

Glacier covered with blankets to reduce summer ice-melt

(Photos: Olivier Maire / EPA)

People living near the Rhone glacier in the central Alps of Switzerland have come up with a striking tactic to counter the effects of climate change. Each summer the glacier is protected by blankets to keep ice melt to a minimum, the European Pressphoto Agency reports.  

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(Source: nbcnews.com)

Obama: No time for ‘flat-earth society’ on climate change

(Photo: NBC News)

President Barack Obama laid out a far-reaching set of proposals meant to address the driving causes of climate change, headlined by a new directive to begin limiting carbon emissions for new and existing power plants and the announcement of high environmental standards for the proposed Keystone XL oil pipeline to be met before his administration signs off on the project.

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(Source: nbcnews.com)

Natural gas found in drinking water near fracked wells

(Photo: Robert Jackson)

Elevated levels of methane and other stray gases have been found in drinking water near natural gas wells in Pennsylvania’s gas-rich Marcellus shale region, according to new research. In the case of methane, concentrations were six times higher in some drinking water found within one kilometer of drilling operations.

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(Source: nbcnews.com)

Our Fragile Earth

(Photo: NASA / AFP - Getty Images)

Images from outer space highlight the fragility - and the resilience - of our beautiful planet.

More views of Earth on Earth Day 2013.