"A U.S. government investigation of the Trans Alaska oil pipeline has found potentially major safety issues on the line that ships 12 percent of domestic oil supply, making its operation risky until repairs are made, according to a letter sent by regulators to the operator and viewed by Reuters on Friday."

"As Thursday dawned, the extent of the explosion and fire in central Allentown became starkly visible: half a block reduced to cinders by a catastrophe that killed five people, displaced scores from their homes and raised fears about the soundness of the aged gas pipelines beneath the city."

The Keystone XL pipeline, awaiting President Obama's decision on a permit, would import heavy oil from Canada's oil sands to the U.S. It could also mean big bucks for the billionaire Koch brothers, who have avowed themselves Obama's political enemies.

The insurance industry has been battered financially by extreme weather events in recent years. Now it is seeking ways to reduce losses -- including research into hurricane-resistant houses.

"Screaming headlines this week threatened of a wild oyster 'apocalypse' and told foodies to eat up before these precious bivalves become extinct. ... But Julie Qiu, who writes an all-things-oyster blog called In A Half Shell, says, 'Stop panicking and get the facts.'"

"Reserves of corn in the United States have hit their lowest level in more than 15 years, reflecting tighter supplies that will lead to higher food prices in 2011. Increasing demand for corn from the ethanol industry is a major reason for the decline, according to federal officials."

"Tea party favorites on and off Capitol Hill have taken different approaches to EPA's future in recent weeks."

"Scientific research, environmental protection and other priorities of the Obama administration would face steep cuts under a congressional Republican spending plan released Wednesday."

"Ten whooping cranes, the most endangered species of crane in the world, will be reintroduced in a Louisiana conservation area more than 60 years after the birds' numbers dwindled to near zero, the U.S. Interior Department said on Tuesday."