"The first release of genetically modified mosquitoes in the United States began this week in the Florida Keys -- the culmination of a decade-long effort by local mosquito control authorities to see if a genetically modified organism is a viable alternative to spraying insecticides in the region."

"Along the coast of Northern California near the Oregon border, the cool, moist air off the Pacific sustains a strip of temperate rainforests. Soaring redwoods and Douglas firs dominate these thick, wet woodlands, creating a canopy hundreds of feet high. But if you travel inland the mix of trees gradually shifts."

"The Environmental Protection Agency on Monday will take its first significant step to curb climate change, an agency spokesman confirmed, moving to phase down chemicals used in refrigeration and air-conditioning that are thousands of times more potent than carbon dioxide at warming the planet."

"An underground nuclear waste storage tank in Washington state that dates to World War II appears to be leaking contaminated liquid into the ground, the U.S. Department of Energy said Thursday."