Ken Caldeira is a climate scientist at the Carnegie Institution for Science’s Department of Global Ecology and Professor (by courtesy) in the Stanford University Department of Earth System Science. Professor Caldeira has a wide-spectrum approach to analyzing the world’s climate systems. He studies the global carbon cycle; marine biogeochemistry and chemical oceanography, including ocean acidification and the atmosphere/ocean carbon cycle; land-cover and climate change; the long-term evolution of climate and geochemical cycles; and global century-scale energy transitions. Caldeira received his B.A. from Rutgers College and both his M.S. (1988) and Ph.D. (1991) in atmospheric sciences from New York University.