Climate change risk underestimated: study
Pastor Dale Morgan
Climate change risk underestimated: study*
WASHINGTON, Feb 23 (AFP) Feb 23, 2009
The risk posed to mankind and the environment by even small changes in
average global temperatures is much higher than believed even a few
years ago, a study said Monday.
Published by the Proceedings of the National Academy of Sciences, the
study updated a 2001 assessment by the Inter-governmental Panel on
Climate Change that looked at temperature changes and the risks they pose.
"Today, we have to assume that the risks of negative impacts of climate
change on humans and nature are larger than just a few years ago," said
Hans-Martin Fussel, one of the authors of the report.
The new study found that even small changes of global mean temperatures
could produce the kinds of conditions singled out as "reasons for
concern" in the 2001 assessment.
Those included risks to threatened systems such as coral reefs or
endangered species; and extreme weather events like cyclones, heat waves
or droughts.
Other "reasons for concern" involved the way the impact of climate
change is distributed, the aggregate damage caused and the risk of
"large scale discontinuities" such as the deglaciation of the Greenland
ice sheets.
"Compared with results reported in the (2001 assessment), smaller
increases in GMT (global mean temperatures) are now estimated to lead to
significant or substantial consequences in the framework of the five
'reasons for concern,'" the study said.
The report said its conclusions were based in part on observations of
impacts already occurring because of global warming and better
understanding of the risks associated with rising mean temperatures.
They also were based on "growing evidence that even modest increases in
GMT (global mean temperature) above levels circa 1990 could commit the
climate system to the risk of very large impacts on multiple century
time scales," the study said.
Three of the authors of the latest report contributed to the 2001
assessment's chapter on "reasons for concern."
"If the associated risks are larger, the necessity is also larger to
reduce the greenhouse gases emissions and to support affected regions to
cope with the unavoidable consequences of climate change," Fussel said
in a statement.
It was the third report published in recent weeks carrying grim news
about climate change.
On February 15, a report by Chris Field, of the Carnegie Institution and
a former member of the Inter-governmental Panel on Climate Change,
warned that greenhouse gases have accumulated more rapidly in the
atmosphere between 2000 and 2007 than anticipated.
Three weeks before that, a study by Susan Solomon, the senior scientist
at the National Oceanic and Atmospheric Administration, said changes in
surface temperature, rainfall and sea level are "largely irreversible
for more than 1,000 years after CO2 emissions are completely stopped."