WASHINGTON - Large pension funds and companies called Monday for Congress to create a cap-and-trade system for curbing emissions of carbon dioxide and other gases blamed for global warming, the latest among several business-oriented groups to call for a national climate policy. The 65 signers of a letter to President Bush called for a 60 to 90 percent reduction of greenhouse gas emissions from 1990 levels by 2050, a goal that could require, among other changes, a major shift away from fossil fuels used to run power plants and automobiles. The letter promotes a market-based system that would give companies...