Meet Boeing’s response to climate change: the Dreamliner, a composite-material 787 aircraft with a high-performing jet engine, set to debut in mid 2008 (47 airlines have already placed orders). It’s 20 percent more fuel-efficient than its competitors, meaning that during each flight, 20 percent less CO2 enters the high atmosphere, where it’s especially damaging. Ideally, Dreamliners won’t just augment fleets; they’ll eventually replace them. Otherwise, it’s a bit like buying a hybrid—and parking it next to your SUV.