A handful of centuries-old sponges from deep in the Caribbean are causing some scientists to think human-caused climate change began sooner and has heated the world more than they thought.
Other scientists were skeptical of the study's claim that the world has warmed that much more than thought.
He said this study also supports the theory that climate change is accelerating, proposed last year by former NASA top scientist James Hansen.
Carbon dioxide and other gases from the burning of fossil fuels are what causes climate change, scientists have established.
“They are cathedrals of history, of human history, recording carbon dioxide in the the atmosphere, temperature of the water and pH of the water,” Winter said.
Persons:
Malcolm McCulloch, ”, ” McCulloch, “, —, Amos Winter, James Hansen, Natalie Mahowald, McCulloch, Winter, Michael Mann, credulity, ” Mann, El, La Nina, Michael Oppenheimer, ” ___ Teresa de Miguel, ___ Read, Seth Borenstein
Organizations:
University of Western, Associated Press, Indiana State University, NASA, Cornell University, United Nations, University of Pennsylvania, Caribbean, El Nino, La, Princeton University
Locations:
Caribbean, University of Western Australia, Mexico City, AP.org