Reuters: Just weeks from a major U.N. climate summit, rich nations have yet to unveil specific amounts to help poor countries fight global warming, Canada’s finance minister said on Friday. Funding to help poorer nations adapt to rising seas and more chaotic weather is a make-or-break issue for talks to try to seal a broader climate pact in Copenhagen next month. The U.N. climate chief has called for an initial $10 billion in funding to be offered by rich nations in Copenhagen. EU …