"Cargo was slowly moving along the bloated Mississippi River after a costly daylong standstill, while officials kept an eye on the lower Delta where thousands of acres of farmland could be swamped by water that is inching closer to the top of a levee."

"For the second time in six years, the Washington, D.C.-based conservation group American Rivers today put the Susquehanna at the top of its annual 'Endangered Rivers' list, citing rapidly growing and 'poorly regulated' natural gas drilling using hydraulic fracturing, or 'fracking.'"

"Emergency vents that American officials have said would prevent devastating hydrogen explosions at nuclear plants in the United States were put to the test in Japan — and failed to work, according to experts and officials with the company that operates the crippled Fukushima Daiichi plant."

"The Senate on Tuesday blocked a Democratic proposal to strip the five leading oil companies of tax breaks that backers of the measure said were unfairly padding industry profits while consumers were struggling with high gas prices."

"An Obama administration plan to protect wildlife and water in U.S. national forests drew fire on Monday from environmental advocates who contend the new rule needs stronger scientific standards."

"Traveling through a rural part of the U.S. state of Georgia recently, Charles Seabrook heard a high-pitched whirring so loud he thought the engine of his pickup truck was overheating."

"A solar energy plane made the world's first international flight powered by the sun on Friday to show the potential for pollution-free air travel."

"The Obama administration is pushing back against plans by its oil spill commission co-chairman to spread his message about offshore drilling reforms to Cuba, the panel leader said today."