Though the Kyoto Protocol went into effect last week, it won't be a quick fix: global temperatures are predicted to rise well into this century. We look at some technologies — from wind power to hydrogen fuel cells — that could curb climate change.
Peter Schwartz, coauthor, The Long Boom: A Vision for the Coming Age of Prosperity. Chairman and cofounder, Global Business Network
Jennifer Morgan, director, International Climate Change Program, World Wildlife Fund, Bonn, Germany