"After careful analysis of oil prices and months of negotiations, President Obama on Friday determined that there was sufficient oil in world markets to allow countries to significantly reduce their Iranian imports, clearing the way for Washington to impose severe new sanctions intended to slash Iran’s oil revenue and press Tehran to abandon its nuclear ambitions."

"Kelp off Southern California was contaminated with short-lived radioisotopes a month after Japan’s Fukushima accident, a sign that the spilled radiation reached the state's coastline, according to a new scientific study."

"The five-day-and-counting mega-engineering challenge continues at Total's Well-from-Hell in the North Sea. That name was coined by Frederic Hauge of Bellona, a Norwegian group that monitors the oil industry:

"A future on Earth of more extreme weather and rising seas will require better planning for natural disasters to save lives and limit deepening economic losses, the United Nations said on Wednesday in a major report on the effects of climate change.

"TOKYO -- One of Japan’s crippled nuclear reactors still has fatally high radiation levels and hardly any water to cool it, according to an internal examination Tuesday that renews doubts about the plant’s stability."

"Scientists, environmentalists and farm advocates are pressing the question about whether rewards of the trend toward using more and more crop chemicals are worth the risks, as the agricultural industry strives to ramp up production to feed the world's growing population."

"Total says wind is blowing gas away from flare on Elgin platform – but there is a high risk of explosion if two come into contact."

"On Monday, the film director and explorer James Cameron became the first human to reach the world’s deepest abyss on his own, the Challenger Deep, which lies 62 miles southwest of Guam in the Pacific Ocean. The dive had been attempted only once before, in 1960, when Don Walsh, a retired United States Navy captain, and Jacques Piccard, a Swiss engineer, reached the spot in the Navy submersible Trieste."

"LONDON -- A gas cloud has encircled Total's Elgin Franklin platform in the North Sea after failed attempts to shut a problematic production well caused a leak, an RMT union official said, based on eyewitness accounts from workers on nearby rigs."

"The world is close to reaching tipping points that will make it irreversibly hotter, making this decade critical in efforts to contain global warming, scientists warned on Monday."