"An internal investigation by the owner of the rig that exploded in the Gulf of Mexico last year has largely blamed BP for the disaster."

"MINOT, ND -- Minot city officials, residents and the North Dakota National Guard today worked together to ensure a safe evacuation of some 12,000 people and 4,200 homes in Minot, as the Souris River overtopped its levees, flooding streets and washing away some homes."

"Crews have made significant progress attacking three major wildfires in Arizona, but fire danger across the Southwest will remain for weeks to come until seasonal rains arrive."

"Steps to boost atomic safety after Japan's Fukushima accident must be 'cost-effective,' an industry body said on Tuesday, a day after the UN nuclear chief suggested power firms could help pay for expanded safety checks."

"Federal regulators have been working closely with the nuclear power industry to keep the nation’s aging reactors operating within safety standards by repeatedly weakening those standards, or simply failing to enforce them, an investigation by The Associated Press has found."

"As record floodwaters along the Missouri River drench homes and businesses, concerns have grown about keeping a couple of notable structures dry: two riverside nuclear power plants in Nebraska."

"The U.N. nuclear chief proposed international safety checks on reactors worldwide to help prevent any repeat of Japan's atomic crisis, a plan which may face resistance from nations worried about outside involvement."

"A major offshore Arctic oil spill could severely challenge the Coast Guard, with no available infrastructure to base rescue and clean-up operations, the Coast Guard commandant said on Monday."

The Missouri River flooding confronting Iowans is "a historic double punch expected to continue at least into August and one that worries even the most battle-hardened veterans of previous flood fights."