"SHANGHAI/HONG KONG --  Chinese authorities slaughtered over 20,000 birds at a poultry market in Shanghai on Friday as the death toll from a new strain of bird flu mounted to six, spreading concern overseas and sparking a sell-off in airline shares in Europe and Hong Kong."

"Tokyo Electric Power Co. (9501), the operator of the Fukushima Dai-Ichi plant, said a cooling system for one of its spent fuel pools at the crippled nuclear station stopped today."

"The government on Thursday recommended the removal of four hydroelectric dams on the Klamath River in Oregon and California to aid native salmon runs and help resolve a decades-long struggle over allocation of scarce water resources."

"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."

Next year, Ontario will become the first industrial region in North America to eliminate coal-fired electrical generation.

"Growing environmental objections to exporting coal from Washington state and Oregon have begun to endanger the coal industry’s hope to restore its flagging fortunes by shipping much more of the embattled fossil fuel to China and India."

"Rumors of Scripps begone -- geophysicist Marcia McNutt, who stepped down as head of the U.S. Geological Survey (USGS) in February, is returning to Washington, D.C., as the new editor-in-chief of Science. McNutt will take over the editorship on 1 June from Bruce Alberts, who announced his retirement last year."

"Crisscrossing Michigan are more than 3,100 miles of old wrought- and cast-iron natural-gas pipelines -- the type federal regulators consider the most at risk of corrosion, cracking and catastrophic rupturing. The state's two largest utilities have replaced less than 15% of these pipelines -- 542 miles -- in the past decade."

Rumors that the conservative billionaire Koch brothers could be poised to buy the Tribune Company raise questions about how that might affect Tribune news outlets' coverage of environment and energy issues, in which the Kochs have a substantial stake.