The Environment Report's Lester Graham interviews Interior Secretary Ken Salazar about problems and challenges he faces.

U.S. emissions of carbon dioxide related to energy use fell 2.8 percent last year, driven down by high oil prices and the sagging economy -- the steepest drop since 1982.

Two days of secret meetings in China during July 2008 may have laid the foundation for a new cooperation between the U.S. and China on climate change.

Despite having been banned in most uses for years, carbon tetrachloride, a probable carcinogen, persists in the environment. USA TODAY found it outside 70 of 95 schools in 30 states.

"A climate change bill working its way through Congress this week has been packed with amendments aimed at giving the coal industry a chance to survive if technology to capture carbon dioxide emissions is eventually perfected and deployed."

In the House climate bill, "consumers would receive around $750 billion in direct and indirect handouts and subsidies through 2030 to offset the higher energy costs."

"The Senate confirmed David J. Hayes as a top Interior Department deputy last night as two Republican senators ended a standoff with Interior Secretary Ken Salazar that had held up Hayes's nomination."

"The Senate yesterday unanimously approved three top-level Energy Department nominees and one Interior Department nominee."

Gasoline prices are creeping back upward, but more American drivers are expected to hit the roads this Memorial Day than last year.

"Railroad companies are pressing federal regulators to cut back on trains carrying hazardous materials through urban areas, saying they fear a catastrophic release of toxic chemicals in a large city."