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Stratospheric
Injections Could Help Cool Earth, Computer Model Shows
Washington,
Sept 16: A new study conducted at the National Center for
Atmospheric Research (NCAR) suggests that a two-pronged approach,
involving both injecting sulfate particles in the stratosphere and
cutting the emission of greenhouse gasses, may be more effective in
cooling Earth’s temperature.
The study stresses that the impact of the two processes, which
scientists refer to as geoengineering, will be much stronger if they
are carried out together rather than separately.
Tom Wigley, an official at NCAR, used a computer model for the
study, and calculated the impact of injecting sulfate particles in
every one to four years into the stratosphere.
He tracked sunlight and other energy flowing into and out of the
Earth system, and examined two scenarios that project the impact of
emissions on climate from now to the year 2400.
He says that such injections can provide the world more time to cut
the emission of green house gasses in the environment, provided this
approach is found to be environmentally and technologically viable.
"A combined approach to climate stabilisation has a number of
advantages over either employed separately," he says.
Wigley claims that it is really very difficult to cut the emission
of Carbon di-oxide (CO2) to such an extent that it contains the
temperature from rising more than 3.6 degrees Fahrenheit (2.0
degrees Celsius) over present levels, and this is the reason
researchers began to find an alternative approach to reduce the
impact of climate change.
He says that in the 1970s a strategy was proposed to cool the
climate, which called for injecting large amounts of sun-blocking
sulfate particles into the stratosphere via aircraft or other means.
He believes that Geoengineering can help fight the challenges
economic and technological challenges faced in cutting the emission
of green house gasses. "Geoengineering could provide additional time
to address the economic and technological challenges faced by a
mitigation-only approach," he says.
Wigley however says that geoengineering is not a panacea, as carbon
dioxide from fossil fuel burning has led to an increased
acidification of Earth's oceans.
He says that geoengineering may be help limit global warming, but
the oceans will continue to acidify as greenhouse-gas emissions
climb, threatening certain marine ecosystems.
Wigley further says that mitigation approach alone can potentially
solve both the warming and ocean acidification problems, but it is
facing economical and technological difficulties.
"A relatively modest geoengineering investment could reduce the
economic and technological burden on mitigation by deferring the
need for immediate or near-future cuts in carbon dioxide emissions,"
he says.
Bureau Report
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From
www.zeenews.com/znnew/articles.asp?aid=323001
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