USA Today: Researchers who deal in cold numbers rather than warming climates believe the “significant benefits from curbing greenhouse-gas emissions would justify the costs of action,” a new survey finds. In fact, the survey of economists finds 94% believe the U.S. should join climate agreements to limit global warming. The survey results to be released today come as debate over the economics of global warming moves center stage in Washington, D.C. Republican senators boycotted a hearing …