"Extreme weather is putting America’s power grid to the test, with a year-long run of violent storms and record heat battering a system built for fairer skies."

"PUNTO FIJO, Venezuela -- A huge explosion rocked Venezuela's biggest oil refinery and unleashed a ferocious fire on Saturday, killing at least 39 people and injuring more than 80 others in one of the deadliest disasters ever to hit the country's key oil industry."

"The National Hurricane Center has placed the New Orleans area under a hurricane watch for Isaac, which is now forecast to make landfall at Gulfport on Wednesday at 7 a.m.  as a Category 2 hurricane with sustained winds of 105 mph. The new forecast extends the hurricane watch area westward to Morgan City.

"Policymakers determined to maintain nuclear energy believed most people would still want it as part of the nation’s power generation despite the accident at the Fukushima No. 1 nuclear plant. Their calculations were way off."

"WILDWOOD, Mo. -- The wells supplying people’s homes are running dry here at the heart of the nation’s drought, which the government announced on Thursday has spread to 63.2 percent of the country, centered in the parched earth of the southern Midwest."

"NEW YORK -- Two years before Hurricane Irene created the prospect of a flooding nightmare in New York City, 100 scientists and engineers met to sketch out a bold defense: massive, moveable barriers to shield the city from a storm-stirred sea."

"NASHVILLE, Tenn. -- The Tennessee Valley Authority is liable for a huge spill of toxin-laden sludge in 2008 in Tennessee, a federal judge ruled Thursday."

"Fire scientists are calling it 'the new normal': a time of fires so big and hot that no one can remember anything like it."

"After investing billions of dollars and navigating a gantlet of legal and regulatory hurdles in its seven-year quest to explore for Arctic oil, Royal Dutch Shell PLC could face additional delays as it awaits the end of whale hunting season in the Beaufort Sea."

"Tropical Storm Isaac swirled over the Caribbean on Wednesday and was forecast to become a hurricane as it moved on a track that would put it off the coast of Florida on Monday, the opening day of the Republican National Convention in Tampa."