Christian Science Monitor: 2007 was the year that global warming became a defining issue in world politics. The science behind it has become firmer than ever. People around the world tell pollsters they judge climate change to be a very serious – sometimes immediate – challenge, and a strong majority say they are ready to make lifestyle changes to reduce warming. Nearly all the world’s governments started acting on this issue a long time ago. They have been working together under the 1999 Kyoto Protocol to …