|
|
Article: Humans Began Altering Global Climate Thousands of Years Ago, Study Shows.
- Article from:
- Ascribe Higher Education News Service
- Article date:
- December 8, 2003
CopyrightCOPYRIGHT 2003 AScribe. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
|
Byline: University of Virginia
SAN FRANCISCO, Dec. 8 (AScribe Newswire) -- A new hypothesis suggests that humans began altering greenhouse-gas concentrations and global climate thousands of years ago, long before the 1800s date widely assumed. In a paper to be presented at the December American Geophysical Union meeting in San Francisco and published in the December issue of Climatic Change, climate scientist Bill Ruddiman, professor emeritus of environmental sciences at the University of Virginia, concludes that human-caused emissions of carbon dioxide (CO2) since 8,000 years ago, and methane (CH4) since 5,000 years ago have combined to prevent a significant ...