Conservation biologists have successfully trained dogs to use their sharp sense of smell to help in a variety of conservation tasks.

"WASHINGTON -- The federal government is fighting with itself over a massive fire at a Chevron refinery in California that sent 15,000 people to hospitals with respiratory ailments."

"An official with the Army Corps of Engineers told a Congressional committee Tuesday it doesn't plan a broad environmental study on exporting coal from the western United States."

"The antipoverty group Oxfam has come up with a scorecard that evaluates the impact that the supply chains of behemoth food companies have on water consumption, labor and wages, greenhouse gas emissions and nutrition."

"Microbes are known to be able to thrive in extreme environments, from inside fiery volcanoes to down on the bottom of the ocean. Now scientists have found a surprising number of them living in storm clouds tens of thousands of feet above the Earth. And those airborne microbes could play a role in global climate."

"PITTSBURGH -- An ongoing U.S. Environmental Protection Agency study on natural gas drilling and its potential for groundwater contamination has gotten tentative praise so far from both industry and environmental groups."