'Polar vortex' flashback? Weather experts say rare summer cold front on the way

(Photo: NWS Chicago)

Remember last winter’s cold spot, which turned “polar vortex” into a phrase that sent chills through the spines of Americans east of the Mississippi River? Get ready for a flashback. 

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(Source: NBCNews.com)

May was the hottest in recorded history

(Photo: AP)

This was the warmest May since the NOAA started keeping track in 1880, and the second warmest spring ever.

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(Source: NBCNews.com)

Roar? Harley-Davidson to unveil electric motorcycle

(Photo: M.L. Johnson / AP)

Harley-Davidson is expected to unveil its first electric motorcycle next week.

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(Source: NBCNews.com)

Scientists find beautiful new species in Southeast Asia

(Photo: Jodi J L Rowley / Australian Museum via Wwf / AP)

Conservationists document hundreds of new species in Southeast Asia’s Mekong Delta, including beautiful creatures from Myanmar.

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(Source: NBCNews.com)

Carbon Clash: EPA sets new rules, GOP fires back

(Photo: John Amis / AP)

In a move already meeting stiff resistance from powerful energy industry groups, the Obama administration formally announced a proposal Monday that would slash carbon emissions at existing power plants by 30 percent by 2030, compared with 2005 levels.

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(Source: NBCNews.com)

'Unstoppable' Antarctic ice sheet collapse has begun, scientists say

(Photo: James Yungel / NASA)

Two teams of scientists say the long-feared collapse of the West Antarctic Ice Sheet has begun, kicking off what they say will be a centuries-long, “unstoppable” process that could raise sea levels by as much as 15 feet.

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(Source: NBCNews.com)

Rubio: Humans not to blame for climate change

(Photo: Jim Cole / AP)

Potential 2016 presidential candidate Sen. Marco Rubio isn’t willing to blame human activity for the dramatic changes in weather in the world and doesn’t think we can do much about it.

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(Source: NBCNews.com)

Artist shows how climate change could leave cities under water

(GIF via NickolayLamm.com)

The new White House report that issued a dire warning about the nation’s changing climate comes on the heels of another study that illustrated how those changes could leave the world’s largest coastal cities submerged in water.

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(Source: TODAY.com)

American Doomsday: White House warns of climate catastrophes

(Photo: Jim Lo Scalzo / EPA file)

Scorching temperatures, flooded cities, wildfires and changes in the growing season are just some of the hard realities of a changing climate that are beginning to hit Americans directly, says a new White House report.

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(Source: NBCNews.com)

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)