International Herald Tribune: Representative John Larson has embarked again on his lonely quest to enact a national tax on carbon dioxide emissions. His idea is to set a modest price on a ton of emissions, gradually increasing it each year until the desired reduction in heat-trapping-gas pollution is achieved. Under the bill he introduced last week, virtually all the revenues from the tax would be returned to the public in lower payroll taxes. “The American people want us to level with them,” Larson, a …