Spiegel: The Danish island of Samso is a mecca for climate protection experts, because its residents generate more energy than they consume — with wind turbines, solar panels, straw combustion and heat exchangers that extract heat from cow’s milk. The small ecotopia will be held up as a model at the UN Climate Change Conference in Copenhagen. Six years ago, Paul Erik Wedelgaard decided it was high time to set a new course for his future, even though he was already 70 at the time. The sun, the …