Sea levels likely to rise 25cm this century
Published: March 17, 2005, 4:50 PM PST
By Michael Kanellos
Staff Writer, CNET News.com
No matter what happens, sea levels and temperatures are going to rise over the next century, according to a pair of reports out of the National Center for Atmospheric Research.
Global warming will likely cause the sea level to rise by about 25cm, or close to a foot, by 2100, while average temperatures will rise by at least a half degree Celsius, according to Tom Wigley, a researcher at the agency and an author of one of the studies released today. Researcher Gerald Meehl wrote the other.
Wigley added that global warming is caused by greenhouse gases like carbon dioxide pumped into the atmosphere by human activity. Even if humans stopped pouring greenhouse gases into the atmosphere today, sea levels will rise by 11 centimeters (about 4 inches) over the next century at a minimum, the studies predicted.
"That is an extreme lower bound of what might happen," Wigley said. "More likely, the sea level rise will be considerably greater." A worst-case scenario predicts a 30-centimeter rise in sea level and a world temperature rise of 3.5 degrees Celsius. Worldwide sea levels rose by 5 centimeters in the 20th century, when human-induced global warming began to be tracked.
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