Despite tens of billions spent under the 1972 Clean Water Act to upgrade the sewage-handling systems of U.S. cities, many have reached capacity and are unable to handle wet-weather flows. The result is that many are "violating the law by dumping untreated or partly treated human waste, chemicals and other hazardous materials into rivers and lakes."

"Hackers broke into the electronic files of one of the world's foremost climate research centers this week and posted an array of e-mails in which prominent scientists engaged in a blunt discussion of global warming research and disparaged climate-change skeptics."

"The Catalina Island Conservancy has been rounding up the herd so females can get a reversible contraceptive vaccine. The goal: Control the size of the herd to keep it and the environment healthier."

"With its gleaming red, blue and green feathers, the painted bunting is often described as the most beautiful migratory songbird in North America. After a 30 year decline and extirpation from parts of its U.S. range, the species appears to be recovering."

"Trees along big city streets have a rough life. Between pollution, development, and vandalism, street trees die off at a pretty alarming rate. One New York artist thinks if people knew more about street trees, they’d appreciate them more -- and treat them better."

"One of the great mysteries about North America is what killed off woolly mammoths and other exotic animals that roamed the land after the last ice age. Ideas have ranged from a comet impact and climate change to human hunters. A study published Friday in Science Magazine provides new clues about this — cleverly deduced from samples of a fungus that grew on the animals' dung."

NIEHS Director Linda Birnbaum says she is concerned that as U.S. manufacturers shift away from toxic chemicals in consumer goods to alternative chemicals, "we kind of jump from the proverbial fry pan into the fire."

"U.S. EPA moved closer yesterday to finalizing new engine and fuel standards for the largest ocean-bound ships by sending the draft rules to the White House for review."

"The Earth’s oceans, which have absorbed carbon dioxide from fuel emissions since the dawn of the industrial era, have recently grown less efficient at sopping it up, new research suggests."