"Caves are home to some of the planet's most unusual creatures and important drinking water supplies. Now these underground resources are being polluted by surface activities, ranging from sewage spills to old factories. Experts call the problem 'extensive and serious.' Mammoth Cave National Park in Kentucky, Crevice Cave in Missouri and Whispering Canyon Cave in Alaska are examples. 'People need to be aware that there’s a subterranean ecosystem and that what happens on the surface impacts these unique ecosystems in a very real way,' said David Culver, a biologist at American University."

"Crops are wilting in the countryside, and the capital's water shortage has turned dire as Mexico grapples with its worst drought in more than half a century."

"Dam projects by neighbouring states are drastically reducing the flow of the Tigris and Euphrates and helping to turn a once-fertile plain into desert."

"U.S. scientists say persistent winds and a weakened current contributed to higher than normal June and July sea levels along the Eastern Seaboard."

"On New Year’s Day, 2009, in the tiny northeast Pennsylvania town of Dimock, a drinking-water well blew up because of a methane leak associated with natural-gas drilling nearby."

"Gov. Arnold Schwarzenegger sent a letter to Secretary of the Interior Ken Salazar and Secretary of Commerce Gary Locke asking them to reverse the federal government’s restrictions on water use intended to protect fish in the Sacramento-San Joaquin River Delta."

"Scientists who returned to the Bay Area this week after an expedition to the "Great Pacific Garbage Patch" brought piles of plastic debris they pulled out of the ocean — soda bottles, cracked patio chairs, Styrofoam chunks, old toys, discarded fishing floats and tangled nets."

"San Francisco Bay and the delta are dying. Salmon runs are collapsing. Droughts are getting worse. And big agriculture still wants more water."

"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."