Levels of carbon dioxide in the Earth's atmosphere are rising faster than predicted, researchers say. Also, carbon sinks — places that take CO2 out of the atmosphere — aren't absorbing the gas as well as they used to. Several new papers propose new ways to combat global climate change.
Eileen Claussen, president of the Pew Center on Global Climate Change
Christopher Field, director of the department of global ecology, Carnegie Institution of Washington; professor of biology at Stanford University
Steve Rayner, professor of science and civilization and director of the James Martin Institute at University of Oxford; member of the Royal Commission on Environmental Pollution
Gerard Roe, associate professor of the department of earth and space sciences, University of Washington