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ABOARD THE CLIMATE EXPRESS: A train splashed with a green stripe is carrying 450 UN officials, climate activists and journalists from Belgium to the climate summit in Copenhagen to symbolize efforts to reduce the convention's carbon footprint.
Railway officials say the equivalent of the electricity needed to run the Climate Express was bought from renewable sources.
UN Environment Program Director Achim Steiner says it's possible to adopt more climate-friendly lifestyles, pointing to Germany's move away from fossil fuels over 10 years.
He called Saturday for more investment in public transportation.
About 15,000 people are expected at the convention opening Monday, which aims to reach a political deal to control global greenhouse gases. Most will come by highly polluting aircraft.