Reuters: Tiny Tuvalu, which fears being wiped off the map by global warming, appealed on Thursday for a legally binding outcome at U.N. climate talks in Denmark and demanded a tough cap on temperature rises. Prime Minister Apisai Ielemia said he would not sign an agreement at the end of the Dec 7-18 talks in Copenhagen that supported a 2 degree Celsius cap on a global average temperature rise, saying this would doom his country. "We are talking about the survival of our nation," Ielemia …