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Eco-photos of the week: Oct. 25-31

Oct. 28, 2009, 11:20 a.m.
350 International Day of Climate Action

Photo: 350.org/Flickr

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350 International Day of Climate Action

Cars stuck in the sand somewhere in the United States display the signature 350 a part of 350 International Day of Climate Action. Around the globe, participants showed their support for an international agreement on carbon dioxide emissions by displaying the 350 in every conceivable fashion. 350 refers to what many scientists say is the safe upper limit for CO2 in our atmosphere.