"U.S. crude oil futures fell on Friday for the fourth day in a row, hitting their lowest levels in nearly eight months and extending losses to a fifth week, as weak U.S. jobs data, soft Chinese manufacturing and the deepening euro zone crisis sparked a broad market selloff. "

"Chinese manufacturers of towers for wind turbines received unfair subsidies and must now pay duties of 13.7 to 26 percent, the Commerce Department said on Wednesday in a preliminary decision in a case brought by four American manufacturers of the towers. The decision, the third trade case decided this year in favor of American wind and solar manufacturers, will be followed by another in the coming weeks on whether Chinese companies engaged in dumping the towers in the United States at prices below the cost of making them."

"Energy companies are nervously following the investigation of Wal-Mart Stores Inc.'s alleged corruption in Mexico. While the link between the energy industry and the retail behemoth isn't obvious, attorneys who advise oil and gas companies say the U.S. government will focus more on petroleum companies as a result of the Wal-Mart investigation."

"The world's air has reached what scientists call a troubling new milestone for carbon dioxide, the main global warming pollutant.

Monitoring stations across the Arctic this spring are measuring more than 400 parts per million of the heat-trapping gas in the atmosphere. The number isn't quite a surprise, because it's been rising at an accelerating pace. Years ago, it passed the 350 ppm mark that many scientists say is the highest safe level for carbon dioxide. It now stands globally at 395.

"Refugee workers in the Sahel region where thousands of Malian refugees are fleeing violence in their country said this week they are witnessing firsthand the knotted challenges of food security, climate change and conflict in Africa."

"TEHRAN, Iran - Computer technicians battling to contain a complex virus last month resorted to the ultimate firewall measures - cutting off Internet links to Iran's Oil Ministry, rigs, and the hub for nearly all the country's crude exports."

Some new lines of evidence are confirming a decades-old conclusion that climate change was the key cause for the end of the ancient Harappan civilization in what is now the Indus valley of India, Pakistan, and neighboring regions.

"Low levels of nuclear radiation from the tsunami-damaged Fukushima power plant have turned up in bluefin tuna off the California coast, suggesting that these fish carried radioactive compounds across the Pacific Ocean faster than wind or water can."

"The latest round of international climate change talks finished on Friday in discord and disappoint

"TOKYO — What passes for normal at the Fukushima Daiichi plant today would have caused shudders among even the most sanguine of experts before an earthquake and tsunami set off the world's second most serious nuclear crisis after Chernobyl."