Daily Roundup: February 23, 2009

Mercury Rising: Led by the U.N. in Nairobi, Kenya, more than 140 countries, including the U.S., agreed to forge a treaty toward reducing worldwide mercury emissions. TreeHugger

But Not For Long: The U.S. Supreme Court denied a request to consider overturning a Bush-era rule that went easy on mercury emissions from power plants. Scientific American

Heat’s Back On: Wildfires returned to Australia just two weeks after firefighters quieted blazes that killed 200. National Geographic

Underlying Threat: As Arctic permafrost thaws, it’ll release huge amounts of methane, a greenhouse gas that’s 20 times more potent than carbon dioxide. Los Angeles Times

MTVegan: MTV is running slightly shocking nationwide ads for five weeks that demonize factory farms; the ads end by encouraging viewers to go to TryVeg.com. Ecorazzi

--Avital Binshtock