"The government has no way of fully knowing which U.S. chemical facilities stock ammonium nitrate, the substance that exploded last year at a Texas fertilizer plant and killed 14 people, congressional investigators say. Outdated federal policies, poor information sharing with states and a raft of industry exemptions point to scant federal oversight, says a new report obtained by The Associated Press."

"When a mile-wide tornado roared through Joplin, Mo., it killed 158 people and injured thousands. And it also kicked up toxic remnants from the city’s industrial past that are still haunting its residents on the third anniversary of the disaster."

Some nuclear power plants could face hazards from climate-driven sea-level rise much greater than the levels they were designed for.

"Bosnia said on Monday that more than a quarter of its 4 million people had been affected by the worst floods to hit the Balkans in living memory, comparing the "terrifying" destruction to that of the country's 1992-95 war."

"A federal appeals court has refused to reconsider a major decision in the long-running battle over the 2010 gulf oil spill, leaving in place an earlier ruling that forces the British oil company BP to pay some businesses for economic damages without the businesses having to prove the losses were directly caused by the spill."

"The removal of a 2,500-ton deposit of coal ash in the Dan River from a spill in North Carolina has begun."

"The devastating wildfires scorching Southern California offer a glimpse of a warmer and more fiery future, according to scientists and federal and international reports."

"A proposed natural gas export facility in Southern Maryland cleared another hurdle Thursday, when a federal review found the controversial project poses no significant risks to nearby residents' safety and no major environmental impacts."

"People in heavily populated Pacific and Indian Ocean coastal regions beyond the tropics should take heed, U.S. scientists said on Wednesday, because tropical cyclones increasingly are packing their biggest punch farther from the equator."