An attendee dressed as a "Navi" from the new movie "Avatar." Some believe the film has an environmental advocacy message.
By Mana Rabiee
More than 100 climate activists braved the icy waters of the Chesapeake Bay to bring public attention to global warming.
Hundreds came to watch friends and families run into the chilly waters of the bay in Annapolis Saturday morning as part of the Fifth Annual Polar Bear Plunge.
The event was organized by the Chesapeake Climate Action Network. Their theme this year was the number 350.
That's the parts per million that environmental activists say is the safe upper limit for carbon dioxide in the atmosphere.
"It sounds a little wonky and scientific," says Climate Action Network spokesman Mike Tidwell, "but we just need the whole world to know that number, 350, 3-5-0, that's safety in terms of carbon pollution."
Tidwell says last month's climate change talks in Copenhagen resulted in a general commitment to bringing that level to 780 parts per million, much higher than activists like him say is safe.