A rare chance for people to walk through the mile-long tunnel that gives entrance to Zion National Park was part of the park's centennial celebration.

"The shipping industry is an invisible and nearly unregulated environmental disaster."

"Indiana and Kentucky are the nation's top two states for coal ash ponds — and many of the holding basins for the toxic mess were built without the guidance of trained engineers, according to new information from the U.S. Environmental Protection Agency."

"The Station blaze [near L.A.] has destroyed more than 50 buildings and burned more than 105,000 acres of mountainous brush. Little hope of containment is seen as long as hot, dry conditions continue."

"Carbon dioxide will soon be declared a dangerous pollutant - a move that could help propel slow-moving climate-change legislation on Capitol Hill, the head of the Environmental Protection Agency said Monday."

"U.S. Senate Democrats announced on Monday a new delay on climate change legislation, which could make it more difficult for President Barack Obama to win progress on that front before a global environmental summit in December."

"LOS CABOS, Mexico – Emergency workers struggled to evacuate thousands of reluctant slum dwellers as extremely dangerous Hurricane Jimena approached Mexico's resort-studded Baja California Peninsula on Tuesday."

"A major problem facing municipalities around Albany County: sewer systems that are often overrun by heavy rain and governments that don't have the millions of dollars needed to upgrade often antiquated systems."

Shallow rivate wells in part of West Palm Beach, drilled illegally by contractors, may be exposing homeowners there to drinking water contamination. People there fear a possible cancer cluster.

A University of Tennessee at Chattanooga study shows that the metals and organic chemicals found in used cigarettes can leak out, contaminating water and killing microorganisms.