What better way to ride out Armageddon than in the new quasi-military, $48,000, 11-mile-per-gallon Hummer H2? But waitdoesnt that apocalypse loom precisely because wannabe Rambos drive hulks like these, accelerating global warming and increasing our dependence on Mideast oil? No worries: Hummer owners can watch the ice caps melt in style on a 15-inch DVD screen from their tent-and-table camping package with awning and plug-in cooler. And it isnt just the Hummer: The fuel economy of new vehicles sold in the United States has declined for the past three years. Detroit has the technology to build safe, fuel-efficient cars, but claims that drivers are more interested in high testosterone levels than high mileage.