A proposed dam on the Similkameen River close to the border between Washington and British Columbia raises thorny trans-border water issues.

"Federal officials must reconsider the irregular water releases from Glen Canyon Dam, which may harm the humpback chub, an endangered fish."

"Environmentalists feel betrayed by the EPA's decision not to block new mountaintop mining projects."

"Delegates from 174 countries and 230 nongovernment interest groups meet from Monday through June 12 in Bonn, Germany, in the second of five negotiating conferences to culminate with a final agreement being adopted in December in Copenhagen, Denmark."

Refugees from lands made uninhabitable by climate change -- expected in tens of millions -- may soon be threatening peace and security in many parts of the world. The UN is expected soon to address this issue.

"There are significant questions about the robustness of the numbers at the heart of the new report estimating more than 300,000 deaths are already being caused each year by global warming...."

The toxic, PCB-laced sediment now being dredged from the Hudson River has to go somewhere -- a landfill in Texas.

"Camp Lejeune, a sprawling Marine base on the North Carolina seaboard, is the site of what some scientists call the worst public drinking-water contamination in the nation's history."

"The federal government should ban the use of lead weights, those fingertip-size chunks of metal that balance the tires of cars and trucks, says a petition filed with the U.S. Environmental Protection Agency last week."

A new technology called LED lighting promises more savings in greenhouse emissions and longer appliance life than compact fluorescent bulbs -- at a price.