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"For decades, cowboys known as 'tick riders' have patrolled the U.S.-Mexico border to prevent cattle carrying 'fever ticks' from entering."

"West Nile virus cases nationally were up 40% from last week, now totaling 1,590, including 66 deaths, the Centers for Disease Control and Prevention said Wednesday."

The dramatic drop in the price of natural gas as a result of the U.S. fracking boom may doom the profitability of future coal-burning power plants. It is just one example of how imperfect information about the future makes energy markets uncertain and risky.

"LOUISVILLE, Ky. — The sooty-looking black gunk has been here for as long as anyone can remember, creeping on the outside of homes, spreading over porch furniture, blanketing car roofs, mysterious and ever-present."

"Two U.S. health and environment organizations sued the federal government on Wednesday for what the groups say is a failure to implement and enforce a new food safety law that could help prevent thousands of deaths caused by food-borne illnesses each year."

"The G.O.P. platform approved Tuesday in Florida included tough language on many expected issues like abortion, but also takes a stand on an issue that has historically been out of the party’s mainstream: Agenda 21."

"NEW ORLEANS — Isaac's whistling winds lashed this city and the storm dumped nearly a foot of rain on its desolate streets, but the system of levee pumps, walls and gates appeared to withstand one of the stiffest challenges yet. To the north and south, though, people had to be evacuated or rescued as Isaac lingered over Louisiana."

"As the Caribbean grapples with the pollution of its waters, the ratification of a protocol designed to help arrest the problem appears to be gathering steam."

"When GOP presidential candidate Mitt Romney visited an Ohio coal mine this month to promote jobs in the coal industry, workers who appeared with him at the rally lost pay because their mine was shut down."