Relocating trees to forestall global warming is being examined by many scientists, says Glenn Howe, a forest genetics professor in FES. So is planting forests to hedge against die-offs from increasing drought, insect infestations, population growth and development. Coast redwoods are spectacular at capturing carbon dioxide. They're fire-resistant thanks to their thick bark. But redwoods and giant sequoias are finicky about where they grow, which could make them less desirable for global plantings than more "cosmopolitan" trees, Howe says.