Energy: An oil company wants to invest its profits in clean-burning American natural gas. A Hungarian billionaire and a "green" politician want to stop it. This is the real Climate-gate scandal. While the greenies of the world united in Copenhagen to talk about the weather, emitting a Third World-country-size chunk of greenhouse gases to gather there, the world's largest oil company, Exxon Mobil, was doing something about it. On Dec. 14, Exxon