"SYDNEY, Australia -- Earth Hour 2012 organizers are jubilant today after a satisfyingly successful global event on March 31. Lights went out at 8:30 pm local time as Earth Hour circled the world through a record 150 countries and territories, with 6,494 towns and cities participating."

"WASHINGTON -- The leaders of the United States, Mexico, and Canada [Monday] pledged to develop 'continental energy, including electricity generation and interconnection' across national borders and welcomed 'increasing North American energy trade.'"

"LYON, France -- For the first time, heads of environmental, biodiversity and natural resources agencies from across the world have met with heads of law enforcement agencies to craft a global compliance and enforcement strategy for environmental security."

What do meltwater surges at the end of the last Ice Age tell us about the manmade climate change that is happening today?

"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."