January 19, 2009
Scientists say global warming real
A wide range of Earth scientists say humans contribute significantly to global warming, suggests a poll conducted by the University of Illinois at Chicago.
The poll should dispel doubts by some that a consensus about global warming exists among scientists, said Peter Doran, a University of Illinois professor who conducted the poll with students last year.The 3,146 Earth scientists interviewed around the world overwhelmingly agreed that global temperatures have risen in the last 200-plus years and human activity is a significant factor, Doran said in a statement released Monday.
The scientists, chosen from the 2007 edition of the American Geological Institute's Directory of Geoscience Departments, were asked two questions via e-mail: if mean global temperatures have risen compared to pre-1800s levels, and if human activity has been a significant factor in changing mean global temperatures.
About 90 percent of those polled agreed with the first question and 82 percent the second question, Doran said.