"IQALUIT, Nunavut -- The eight Arctic Council nations pledged on Friday to do more to combat climate change that is shrinking the vast frigid region, with countries trying to put aside disputes over issues like Russia's intervention in Ukraine."

"Nevada's Lake Mead, the largest capacity reservoir in the United States, is on track to drop to its lowest water level in recorded history on Sunday as its source, the Colorado River, suffers from 14 years of severe drought, experts said on Friday."

"As rescuers desperately searched for survivors who may be buried amid the rubble in the Nepalese capital of Katmandu or trapped in remote mountain villages, officials announced that more than 3,700 people are now confirmed dead after the earthquake that struck Saturday."

An electric utility industry group this week released a report warning that EPA's "Clean Power Plan" to address climate change could hurt grid reliability. The report offers ammunition for the plan's opponents -- especially Republicans from coal-mining and coal-burning states. But a number of critics say the report's analysis is flawed.

"It's Arbor Day, and some arborists in D.C. have a little more work to do thanks to a new website. It's called Get D.C. Trees and makes it easier than ever for residents to request new trees along their neighborhood streets."

"Minnesota declared a state of emergency on Thursday over a fast-spreading strain of avian flu that has led to the extermination of more than 7.3 million birds in the country. It followed Wisconsin's action on Monday."

"It’s probably in your garage and on your lawn. And it’s used on nearly every acre of corn and soy. But what risks does it pose?"

"Scientists, planes and instruments descend on San Juan Basin to find roots of the massive greenhouse gas hotspot."

"What happens in the Arctic doesn’t stay in the Arctic. That will be a key message over the next two years when the United States holds the rotating chair of the Arctic Council, a group that fosters cooperation between the eight countries sharing the Arctic region."

"For the better part of the last century, crude oil prices have swung like a pendulum, pushing and pulling the fortunes of nations. More often than not, global supplies of the volatile commodity were controlled by the rulers of desert domains who would otherwise have been powerless had it not been for the oil that bubbled beneath their thrones." Not any more.