Letters

Readers responded to September's special issue "Energy's Future: Beyond Carbon" like there was no tomorrow--with critiques, alternatives and prescriptions to help assure that there will be. Critical letters ranged from global warming deniers to cautious skeptics, many of whom felt it was unscientific for Gary Stix to pronounce in the introduction, "A Climate Repair Manual," that "the debate on global warming is over." Vern Porter of Elk Grove, Calif., begged to differ: "It seems potency of water vapor as a greenhouse gas is largely ignored and its capacity to moderate temperatures unappreciated."