Climate-change activists and Democrats on Capitol Hill are gearing up to push the U.S. to limit so-called greenhouse gases. In their telling, America must save mankind from an eco-Apocalypse by adopting the arbitrary targets popular with Europe and other Kyoto Protocol signatories. Well, let's look at results in the real world, as opposed to this Kyoto spin. Recent data show that placing artificial limits on emissions hasn't done all that much to reduce emissions, and may even be counterproductive. Contrary to caricature, the American approach offers more promise than Europe's. As the nearby chart shows, CO2 emissions growth in the...