Climate change| NBC News

NASA unveils Grand Challenge to hunt asteroids
NASA's latest "Grand Challenge" is a biggie: Can you think of better ways to find potentially threatening near-Earth asteroids and do something about those threats?

Facebook may add videos to Instagram, rumors suggest

Last telegraph shuts down in July but some say "Don't. Stop."

Facebook is down for some users

Catherine the Great, Tchaikovsky letters returned

INTERACTIVE

Climate Connections
It's still something of a puzzle, but the symptoms of global warming are strong as is the evidence for a significant manmade contribution. Check out the pieces and suggest your own additions.

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Slideshows

Francesco Zizola / NOOR	Rising ocean levels threaten Maldives The Maldives, the lowest-lying nation on Earth, is at risk of disappearing from the world map, scientists say.
Stanley Greene / NOOR	Greenland’s shrinking ice hurts native tribe The Inuit, who survived for centuries by hunting seals and whales, are watching their way of life disappear.
Jon Lowenstein / NOOR	Picturing Climate Change View some of the causes and consequences of climate change from around the world.