Reuters: Developing countries said on Wednesday they risked “total destruction” unless the rich stepped up the fight against climate change to a level that even the United Nations says is out of reach. The top U.S. climate diplomat Todd Stern blamed a “17-year divide” between rich and poor nations for slow progress at the U.N. talks meant to agree a global climate deal in Copenhagen in December, and slammed “debating society” pranks. Keeping up pressure in Barcelona, the final …