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"COLUMBUS, Ohio -- A freight train derailment and explosion in Columbus, Ohio, has authorities evacuating a mile-wide area of the city as they try to contain the blaze and determine what's burning."

"Two years ago this month, an oil pipeline burst in Michigan, contaminating 38 miles of the Kalamazoo River. It didn't get much national notice because everyone was focused on the massive BP oil spill in the Gulf of Mexico."

"Some of the weather extremes bedeviling people around the world have become far more likely because of human-induced global warming, researchers reported on Tuesday. Yet they ruled it out as a cause of last year’s devastating floods in Thailand, one of the most striking weather events of recent years."

"The worst wildfire season in decades is not only blackening tens of thousands of acres in Western states; it is also creating significant environmental damage."

"With temperatures in the triple digits in many parts of the United States and not far from it in the rest of the country, lots of people are seeking relief on the sandy shores. But before you head to the beach, you might want to make sure that cool ocean air isn't carrying a whiff of sewage first."

"The power industry is waiting for a federal appeals court to rule on proposed emissions controls for coal-fired power plants, a decision with implications for energy sectors ranging from natural gas to coal to tradeable pollution permits."

"The first signs of bipartisan support for overhauling the nation's chemical safety law emerged Monday, as three Republicans joined 23 other senators calling for tough restrictions on toxic flame retardants."

"Canada's prime minister, Stephen Harper, faces a widening revolt by the country's leading scientists against sweeping cuts to government research labs and broadly pro-industry policies. The scientists plan to march through Ottawa in white lab coats on Tuesday in the second big protest in a month against the Harper government's science and environmental agenda."

"A new water-purification system using solar power to purify contaminated groundwater holds promise for solving water problems not only on the Navajo Nation, where it is being tested, but for many other indigenous communities as well."

"Tom Dettweiler makes his living miles down. He helped find the Titanic. After that, his teams located a lost submarine heavy with gold. In all, he has cast light on dozens of vanished ships. Mr. Dettweiler has now turned from recovering lost treasures to prospecting for natural ones that litter the seabed: craggy deposits rich in gold and silver, copper and cobalt, lead and zinc."