"California Governor Jerry Brown and Mexican environmental officials signed a pact on Monday aimed at reducing greenhouse gas emissions, an agreement that could eventually expand the market for carbon credits."

"Failing to adequately reduce the carbon pollution that contributes to climate change could cost the United States economy $150 billion a year, according to an analysis by the White House Council of Economic Advisers released on Tuesday."

"The nation gets its chance this week to blast or praise the Environmental Protection Agency’s sweeping plan to cut climate-warming emissions by 2030."

"Flooding is increasing in frequency along much of the U.S. coast, and the rate of increase is accelerating along the Gulf of Mexico and Atlantic coasts, a team of federal government scientists found in a study released Monday."

"An intrepid bird called the red knot migrates from the southern tip of South America to the Arctic and back every year. But changes in climate along its route are putting this ultramarathoner at risk."

"NEWPORT NEWS, Va. — Coal from Appalachia rumbles into this port city, 150 railroad cars at a time, bound for the belly of the massive cargo ship Prime Lily. The ship soon sets sail for South America, its 80,000 tons of coal destined for power plants and factories, an export of American energy — and pollution."

"Greenhouse gas emissions from burning and extracting coal, oil and natural gas drive climate change, and as communities feel the effects of a warming world — rising seas, burning forests and withering crops — communities’ pocketbooks take a hit, too."

"As the climate warms, the vine that ate the U.S. South is starting to gnaw at parts of the North, too."

"A new study finds more than 75 percent of the water loss in the drought-stricken Colorado River Basin since late 2004 came from underground resources. The extent of groundwater loss may pose a greater threat to the water supply of the western United States than previously thought."