International

"Vegetation change underway in northern forests as a result of climate change creates feedback loop that prompts more warming, scientists say."

"The U.N. atomic energy chief called a Vienna summit to tackle mounting concerns about nuclear safety, saying on Monday the international community needed a coordinated response in the wake of Japan's crisis."

"In the country that gave the world the word tsunami, the Japanese nuclear establishment largely disregarded the potentially destructive force of the walls of water. The word did not even appear in government guidelines until 2006, decades after plants — including the Fukushima Daiichi facility that firefighters are still struggling to get under control — began dotting the Japanese coastline."

"Sharply elevated radiation at the Fukushima Daiichi nuclear complex on Sunday raised the possibility of spreading contamination and forced an evacuation of a part of one of the buildings at the damaged plant."

"Japan's nuclear regulator has amassed power while growing closer to the industry it regulates, according to former regulators and industry critics who blame the trend for lapses that may have contributed to the Fukushima Daiichi accident."

"As the Japanese authorities order a wider evacuation area around the stricken Fukushima reactor complex to as far out as 19 miles, three health and environmental groups in the United States announced that they were seeking further information about why American officials recommended that its citizens keep at least 50 miles away."

"Japanese officials began encouraging people to evacuate a larger swath of territory around the Fukushima Daiichi nuclear plant on Friday as new signs emerged that parts of the crippled facility are so damaged and contaminated that it will be hard to bring the plant under control soon."