"Wildfires sparked by lightning near Canada's Hudson Bay are threatening the habitat of polar bears, encroaching on the old tree roots and frozen soil where females make their dens, a conservation expert on the big, white bears said on Thursday."

"Ever since comprehensive legislation to reduce greenhouse gases died in Congress two years ago, my colleague John Broder noted here recently, climate change has been the issue that national politicians seem to avoid at all costs. Supporting renewable energy? Fine. Advocating energy independence? Great. Calling for action on global warming? Not so much."

"ANCHORAGE -- Shell Oil's delay in drilling Arctic Ocean exploratory wells off Alaska's northern shores is not due to heavy ice or federal regulators, according to Interior Secretary Ken Salazar."

"A variety of laws regulate trade of endangered and threatened species, but many at-risk animals show up on U.S. menus. Most fish and seafood species have yet to be considered for listing on endangered lists. It’s not always possible to figure out where menu items come from."

"ST. LOUIS -- The worst drought in the U.S. in decades may be leveling off or even be easing ever so slightly in some lucky locales, federal weather forecasters announced Thursday in a report of little comfort for farmers and ranchers who already have begun tallying this year's losses."

"The Canadian pipeline company TransCanada has quietly begun construction of the southern leg of the controversial Keystone XL pipeline, installing segments near Livingston, Texas, company officials confirmed Thursday."

"This week, Bill Gates was at a summer fair in Washington State, but he was not eating deep-fried butter on-a-stick, or checking out livestock. Gates was inspecting cutting-edge toilet technology on display at an event his foundation hosted in Seattle — the Reinvent the Toilet Fair."

"A Canadian company opens a test pit in Utah. But is there enough water to support the industry?"