Human activity fueling weird weather, U.S. says. U.S. Climate Change Science Program report said there is strong evidence the increasing frequency of extreme rain, heat, drought and tropical storms is caused by global climate change. [News Source]

Droughts, floods…It’s getting worse, report says. If you think the weather is getting more extreme, you’re right — and global warming caused by human activity probably is the reason, according to a report released Thursday by a panel of government scientists. [News Source]

Greenland’s leafy cover obliterated by climate change. Extensive spruce forests used to cover the southern half of Greenland, according to a Canadian study that gives a remarkable glimpse of the icy island's green past and possible future. [News Source]

Studies reveal climate change acts quickly, forcefully. Extensive spruce forests used to cover the southern half of Greenland, according to a Canadian study that gives a remarkable glimpse of the icy island's green past and possible future. [News Source]

Greenland ice shows rapid climate flips, study says. Violent swings in weather patterns occurred after Earth's climate crossed "tipping points" thousands of years ago, a new study argues. [News Source]

Greenland ice cores show clues to climate change. An analysis of Greenland ice cores shows how atmospheric changes during the last ice age probably spurred wild temperature swings, a finding researchers said on Thursday could help predict future climate change. [News Source]

Greenland’s climate changed abruptly during ice age, study says . Greenland's temperatures rose abruptly twice during the last ice age, said University of Copenhagen-led researchers who studied the phenomenon to learn how the world's climate can change violently. [News Source]

Some see human link in severity of U.S. floods. Natural disasters like floods are normally blamed on nature, but some experts believe humans are at least partly responsible for this month's massive flooding in Iowa and elsewhere in the U.S. farm belt. [News Source]

Climate change killing off the coral reefs. Silently and steadily, a tragedy is unfolding beneath the ocean's waves: Coral reefs around the world are disappearing. According to some projections, there could be few, if any, left by the end of the century. [News Source]

Ocean warming understated, scientists say. Scientific detective work has uncovered a decades-old glitch in ocean temperature measurements and revealed that the world's seas are warming and rising faster than previously reported. [News Source]

Seas rising and warming faster than realized. A new study found that the rate at which seas warmed and rose between 1961 and 2003 was about 50 percent greater than previous estimates. [News Source]