Dealing with global warming will be painful, says one of the most powerful Democrats in Congress. To back up his claim he is proposing a recipe many people won't like _ a 50-cent gasoline tax, a carbon tax and scaling back tax breaks for some home owners.Dingell says he hasn't rule out such a so-called "cap-and-trade" system, either, but that at least for now he wants to float what he believes is a better idea. He will propose for discussion: _A 50-cent-a-gallon tax on gasoline and jet fuel, phased in over five years, on top of existing taxes. _A tax...