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"RIO DE JANEIRO — Athletes in next year's Summer Olympics here will be swimming and boating in waters so contaminated with human feces that they risk becoming violently ill and unable to compete in the games, an Associated Press investigation has found."

"The World Bank said coal was no cure for global poverty on Wednesday, rejecting a main industry argument for building new fossil fuel projects in developing countries."

"For the first time, the U.S. Department of Defense has detailed what it views as its greatest challenges related to climate change. In a report to Congress, the Defense Department said that global warming poses a 'present security threat, not strictly a long-term risk.'"

"Barack Obama will use all of his powers – including his veto – to defend his plan to fight climate change, the White House said, on the eve of new rules cutting carbon pollution from power plants."

"Though the amount of microcystin present in raw Lake Erie water near Toledo’s water-system intake Wednesday was double the amount detected two days earlier, city officials announced they planned to scale back testing for the toxin."

"It's late summer, and Americans are flocking to the country's national parks for some recreation and fresh air."

"Over two years after a runaway freight train derailed, exploded and destroyed much of the small town of Lac-Megantic, Quebec, killing 47, the Obama administration has issued new rules governing breaking procedures for tanker cars carrying volatile cargo."

"WASHINGTON -- A new government rule that promises to do more to protect streams near coal mining operations entered a critical stage this week, with coal industry lobbyists and environmentalists already lining up for battle."

"Protestors rappelled off a bridge and formed a kayak flotilla in Portland, Oregon, on Wednesday hoping to delay Royal Dutch Shell's Arctic oil exploration this summer by blocking the return of a ship to Alaska that holds emergency equipment."