"The surface of Greenland's massive ice sheet has melted this month over an unusually large area, NASA has said."

"WHITEHORSE, Yukon Territory — In February 1942, President Franklin D. Roosevelt gave the Army Corps of Engineers an assignment: Build a road from British Columbia across the Yukon to Alaska — in eight months, before winter sets in."

"The League of Conservation Voters will launch a $1.5 million campaign Tuesday targeting five House Republicans who question the connection between human activity and climate change, in an effort to test whether the issue can sway voters."

"BARROW, Alaska — When the United States Coast Guard arrived in this remote corner of the Arctic this month to begin its biggest patrol presence in the waters north of Alaska, only one helicopter hangar was available for rent, and it was not, to put it mildly, the Ritz."

"The United States is posting rapid growth in the waste of natural gas in new oil fields where the fuel is either burned or vented into the atmosphere.  Experts say the process damages the environment and fails to maximize the return to investors."

"The most expansive drought in more than a half century intensified this week and stretched further into major farm areas of the western Midwest where crops had largely been shielded from the harsh conditions that decimated yields further east."

"More than half of the continental United States is currently suffering through the worst drought in 50 years, with heat and a lack of rain rippling through the middle of the country. Crops are wilting, soils are cracked, and some dried-out forests are catching fire. U.S. corn production in particular is dwindling. So is this a glimpse at our hotter, drier future? It appears so."

"A chunk of ice twice the size of Manhattan has parted from Greenland’s Petermann glacier, a break researchers at the University of Delaware and Canadian Ice Service attributed to warmer ocean temperatures."

"As the climate has warmed during the past several decades, there has been a growing imbalance between record daily high temperatures in the contiguous U.S. and record daily lows. A study published in 2009 found that rather than a 1-to-1 ratio, as would be expected if the climate were not warming, the ratio has been closer to 2-to-1 in favor of warm temperature records during the past decade (2000-2009). This finding cannot be explained by natural climate variability alone, the study found, and is instead consistent with global warming."

"More than 50 percent of the United States is under drought conditions right now, putting 2012 in the same category with some of the worst droughts in the nation's history."