Oil-and-chemical billionaire David Koch lobbies hard to influence U.S. politics and environment and energy policy. Did his money influence the kind of coverage presented on public television?

"Top water decision-makers from seven Western states plan to join conservation groups and Indian tribes in San Diego on Tuesday to begin hammering out rules for squeezing every useable drop from the overtaxed Colorado River."

"Victoria County, a little slice of the Texas chemical coast, has nearly 39 million pounds of concoctions that can poison and nearly 11 million pounds that can catch fire."

"Sen. Jeff Merkley (D-Ore.) set forth an amendment to overturn the provision — which he says allows the unrestricted sale and planting of genetically modified seeds that could be harmful to farmers, the environment and human health — but it was blocked by GOP Senators."

"Denise Mauzerall arrived in Beijing this year at a time that was both horrifying and illuminating. The capital was facing some of its worst pollution in recent memory and Mauzerall, a Princeton environmental engineering professor, was passing through on her way to a university forum on the future of cities."

"Organizing for Action -- a group that formed out of President Obama's re-election campaign -- has posted five tweets in the past week about climate change using the Twitter account."

"If four federal agencies closed their doors, would anyone notice?"

"A coalition of grassroots environmental groups—plus a few professors and celebrities—issued a public message to the Environmental Defense Fund on Wednesday: You don't speak for us on fracking."

"WASHINGTON, DC -- The Obama Administration’s plan to remove the gray wolf from the protections of the Endangered Species Act, as detailed in a draft Federal Register notice released today by Public Employees for Environmental Responsibility, PEER, is temporarily on hold."