Reuters: The Pacific island state of Tuvalu set a goal on Sunday of a 100 percent shift to renewable energy by 2020, hoping to set an example to industrialized nations to cut greenhouse gases it blames for rising sea levels. Tuvalu, a string of coral atolls whose highest point is 4.5 meters (15 ft) above sea level, estimates it would cost just over $20 million to generate all electricity for its 12,000 people from solar and wind power and end dependence on diesel. "We look forward to …