Reuters: French President Nicolas Sarkozy called on all major economies on Friday to act faster to fight global warming, saying new scientific evidence was confirming the "most gloomy scenarios". Sarkozy, speaking at U.S.-led climate talks of 17 nations responsible for 80 percent of greenhouse gas emissions, said rich nations should lead by axing greenhouse gas emissions to help slow impacts such as droughts, floods or rising seas. He did not refer directly to a plan by …