"Environmental groups on Monday asked the Obama administration to extend the approval process of the Keystone XL pipeline, using last month's spill of heavy Canadian crude oil in Arkansas as their latest reason to delay the project."

"With the warming U.S. Arctic region poised for greater oil and mining development, the White House needs to develop a national strategy that can take environmental decisions on a larger scale, a report issued Thursday concluded."

"On one covert video, farm workers illegally burn the ankles of Tennessee walking horses with chemicals. Another captures workers in Wyoming punching and kicking pigs and flinging piglets into the air. And at one of the country’s largest egg suppliers, a video shows hens caged alongside rotting bird corpses, while workers burn and snap off the beaks of young chicks."

"Listeria in cantaloupes. Salmonella in peanuts. E. coli in spinach. Hepatitis A in green onions. In the past decade a rash of tainted food has resulted in thousands of hospitalizations and hundreds of deaths. It has also prompted the most sweeping reform of U.S. food safety laws in more than 70 years."

"Leaky pipes are the 'super low-hanging fruit' of climate change."

"InsideClimate News reporter Lisa Song was threatened with arrest on Wednesday after she entered the command center for the cleanup operation in Mayflower, Ark., where a major oil pipeline spill occurred on Friday."

"The increase is the result of the government last year lowering the threshold for lead poisoning."

"MIAMI -- Responding to criticism after Superstorm Sandy, the National Hurricane Center said Thursday it would change the way it warns people about tropical storms that morph into something else."

"A federal agency has declared that more sick and dying sea lion pups have stranded themselves on southern California beaches so far in 2013 than in the previous five years combined, but scientists are still unsure what is afflicting the mammals."

"The Obama administration is inching ahead with a plan that would allow wastewater from fracking to be shipped on barges, fueling a debate whether it is safer than other transportation modes or risks polluting drinking water."