Boston Globe: WITH GASOLINE costing $4 a gallon and even the Bush administration admitting that global warming is endangering polar bears, the time is right for Congress to enact reductions in the use of fossil fuels that are a principal cause of global warming. Today, the Senate will take up the Lieberman-Warner Climate Security Act, which would slap a cap-and-trade system on utility and industrial emissions and invoke other measures to tackle 85 percent of greenhouse gas emission sources in the United …