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450 or 350 -- Choose One and Go: Thousands demonstrated around the globe on Saturday for 350 parts per million (ppm) while world leaders are still focused on 450 ppm. by erica — last modified Oct 26, 2009 04:15 PM — filed under: UNFCCC, COP-15, greenhouse gas emissions, policy, climate change, legislation, Gavin Schmidt, Jim Hansen, United States, 450 ppm, Bill McKibben, climate disruption, global warming, Copenhagen, carbon dioxide emissions, 350 ppm, temperatures — Relevance: 1%