Continued global warming poses a risk of rapid, drastic changes in some human and natural systems, a scientific panel warned Tuesday, citing the possible collapse of polar sea ice, the potential for a mass extinction of plant and animal life and the threat of immense dead zones in the ocean. At the same time, some worst-case fears about climate change that have
entered the popular imagination can be ruled out as unlikely, at least
over the next century, the panel found. These include a sudden belch of
methane from the ocean or the Arctic that would fry the planet, as well
as a shutdown of the heat circulation in the Atlantic Ocean that would
chill nearby land areas — the fear on which the 2004 movie “The Day
After Tomorrow” was loosely based. In a report
released Tuesday, the panel appointed by the National Research Council
called for the creation of an early warning system to alert society well
in advance to changes capable of producing chaos. Nasty climate
surprises have occurred already, and more seem inevitable, perhaps
within decades, panel members warned. But, they said, little has been
done to prepare. “The reality is that the climate is changing,” said James W. C. White, a
paleoclimatologist at the University of Colorado Boulder who headed the
committee on abrupt impacts of climate change. “It’s going to continue
to happen, and it’s going to be part of everyday life for centuries to
come — perhaps longer than that.”...more
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