Mongabay: The new prime minister of Japan, Yukio Hatoyama, has thrown down the gauntlet to other industrialized nations in the lead-up to the UN Climate Change Summit in Copenhagen this December. He had pledged to cut his nation’s greenhouse gas emissions 25 percent from 1990 levels (the set date for the Kyoto Treaty) by 2020. However, Hatoyama has stated that his country–the world’s fifth in terms of greenhouse emissions–will only stick to this pledge if other nations sign up to similar …