"The extent of Arctic sea ice has reached a record low, a historic retreat that scientists said is a stark signal of how climate change is transforming the global landscape."

"Levees protecting most of the city of Sacramento and 15 other areas of the Central Valley were declared today to have failed federal maintenance criteria. As a result, they are no longer eligible for federal rebuilding funds in the event of a levee breach."

"A settlement reached in federal court promises an accelerated attack on pollution from the labyrinth of pipes under Boston and from pavement runoff, an effort designed to prevent raw sewage and other pollutants from reaching area waterways."

"SAN FRANCISCO -- The Center for Biological Diversity filed a legal petition with the U.S. Environmental Protection Agency Wednesday that asks the agency to set plastic pollution limits for ocean waters under the Clean Water Act."

"Critics say manufacturers are too often making the call on their own products."

"Thawing sea ice and improved technology is opening up the race for natural resource exploration in the Arctic Circle, home to nearly a quarter of the world's untapped oil reserves. Russia leads the race and has promised to adhere to environmental guidelines. But accidents and other damage resulting from the country's oil exploration tell a different story."

"RICHMOND -- An Oakland-based attorney says he has more than 3,000 signed-on seeking legal action against Chevron stemming from a fire at the oil company's local refinery on Aug. 6."

"Extreme weather is putting America’s power grid to the test, with a year-long run of violent storms and record heat battering a system built for fairer skies."

"Alaska health officials, concerned about amateur miners seeking riches in a modern-day mini gold rush, plan to test prospectors in the town of Nome for mercury exposure for fear that archaic mining techniques may be inadvertently harming their bodies."

"PUNTO FIJO, Venezuela -- A huge explosion rocked Venezuela's biggest oil refinery and unleashed a ferocious fire on Saturday, killing at least 39 people and injuring more than 80 others in one of the deadliest disasters ever to hit the country's key oil industry."