Author: postMigrator

Web address:
http://www.sciencedaily.com/releases/2007/10/071027180556.htm

Land Clearing Triggers Hotter Droughts, Australian Research Shows

ScienceDaily (Oct. 31, 2007) – A University of Queensland scientist
has led groundbreaking research which shows that clearing of native
vegetation has made recent Australian droughts hotter.

In an Australian first, they applied the CSIRO Mark 3 climate model,
satellite data and the DNRW supercomputer, and showed that 150 years
of land clearing added significantly to the warming and drying of
eastern Australia.

“Our work shows that the 2002-03 El Nino drought in eastern Australia
was on average two degrees Centigrade hotter because of vegetation
clearing,”  said Dr Clive McAlpine  of the University of Queensland.

“Based on this research, it would be fair to say that the current
drought has been made worse by past clearing of native vegetation.
Our findings highlight that it is too simplistic to attribute climate
change purely to greenhouse gases,” he continued. “Protection and
restoration of Australia’s native vegetation needs to be a critical
consideration in mitigating climate change.”

Dr McAlpine of UQ’s Centre for Remote Sensing and Spatial Information
Science and Mr Jozef Syktus, principal scientist in the Queensland
Natural Resources and Water Department (DNRW), headed a study which
will be published later this year in Geophysical Research Letters,
the journal of the American Geophysical Union. Co-authors are Dr
Hamish McGowan, Associate Professor Stuart Phinn and Dr Ravinesh Deo
– all of UQ – Dr Peter Lawrence of the University of Colorado and Dr
Ian Watterson of CSIRO.

The researchers found that mean summer rainfall decreased by between
four percent and 12 percent in eastern Australia, and by four percent
and eight percent in southwest Western Australia. These were the
regions of most extensive historical clearing.

“Consistent with actual climate trends, eastern Australia was between
0.4 degrees Centigrade and two degrees Centigrade warmer, and
southwest Western Australia was between 0.4 degrees and 0.8 degrees
warmer.

“Native vegetation moderates climate fluctuations, and this has
important, largely unrecognised consequences for agriculture and
stressed land and water resources,” Dr McAlpine said.

Australian native vegetation holds more moisture that subsequently
evaporates and recycles back as rainfall. It also reflects into space
less shortwave solar radiation than broadacre crops and improved
pastures, and this process keeps the surface temperature cooler and
aids cloud formation.

The project, Modeling Impacts of Vegetation Cover Change on Regional
Climate, was funded by Land and Water Australia Research and
Development Corporation (Canberra) as part of their Innovation
Research Program.

Adapted from materials provided by University Of Queensland.
University Of Queensland (2007, October 31). Land Clearing Triggers
Hotter Droughts, Australian Research Shows. ScienceDaily. Retrieved
February 15, 2008, from
http://www.sciencedaily.com-/releases/2007/10/071027180556.htm

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” … halfway measures won’t do the job. To stabilize our planet’s
climate, we need to find ways to kick the carbon habit altogether.”
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Carnegie Institution
Public release date: 14-Feb-2008

Contact: Ken Caldeira
kcaldeira@stanford.edu
650-704-7212

Stabilizing climate requires near-zero carbon emissions

Now that scientists have reached a consensus that carbon dioxide
emissions from human activities are the major cause of global
warming, the next question is: How can we stop it” Can we just cut
back on carbon, or do we need to go cold turkey” According to a new
study by scientists at the Carnegie Institution, halfway measures
won’t do the job. To stabilize our planet’s climate, we need to find
ways to kick the carbon habit altogether.

In the study, to be published in Geophysical Research Letters,
climate scientists Ken Caldeira and Damon Matthews used an Earth
system model at the Carnegie Institution’s Department of Global
Ecology to simulate the response of the Earth’s climate to different
levels of carbon dioxide emission over the next 500 years. The model,
a sophisticated computer program developed at the University of
Victoria, Canada, takes into account the flow of heat between the
atmosphere and oceans, as well as other factors such as the uptake of
carbon dioxide by land vegetation, in its calculations.

This is the first peer-reviewed study to investigate what level of
carbon dioxide emission would be needed to prevent further warming of
our planet.

“Most scientific and policy discussions about avoiding climate change
have centered on what emissions would be needed to stabilize
greenhouse gases in the atmosphere,” says Caldeira. “But stabilizing
greenhouse gases does not equate to a stable climate. We studied what
emissions would be needed to stabilize climate in the foreseeable
future.”

The scientists investigated how much climate changes as a result of
each individual emission of carbon dioxide, and found that each
increment of emission leads to another increment of warming. So, if
we want to avoid additional warming, we need to avoid additional
emissions.

With emissions set to zero in the simulations, the level of carbon
dioxide in the atmosphere slowly fell as carbon “sinks” such as the
oceans and land vegetation absorbed the gas. Surprisingly, however,
the model predicted that global temperatures would remain high for at
least 500 years after carbon dioxide emissions ceased.

Just as an iron skillet will stay hot and keep cooking after the
stove burner’s turned off, heat held in the oceans will keep the
climate warm even as the heating effect of greenhouse gases
diminishes. Adding more greenhouse gases, even at a rate lower than
today, would worsen the situation and the effects would persist for
centuries.

“What if we were to discover tomorrow that a climate catastrophe was
imminent if our planet warmed any further” To reduce emissions enough
to avoid this catastrophe, we would have to cut them close to zero –
and right away,” says Caldeira.

Global carbon dioxide emissions and atmospheric carbon dioxide
concentrations are both growing at record rates. Even if we could
freeze emissions at today’s levels, atmospheric carbon dioxide
concentrations would continue to increase. If we could stabilize
atmospheric carbon dioxide concentrations, which would require deep
cuts in emissions, the Earth would continue heating up. Matthews and
Caldeira found that to prevent the Earth from heating further, carbon
dioxide emissions would, effectively, need to be eliminated.

While eliminating carbon dioxide emissions may seem like a radical
idea, Caldeira sees it as a feasible goal. “It is just not that hard
to solve the technological challenges,” he says. “We can develop and
deploy wind turbines, electric cars, and so on, and live well without
damaging the environment. The future can be better than the present,
but we have to take steps to start kicking the CO2 habit now, so we
won’t need to go cold turkey later.”

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Source: Matthews, H. D., and K. Caldeira (2008), Stabilizing climate
requires near-zero emissions, Geophysical Research Letters,
doi:10.1029/2007GL032388, in press.

Ken Caldeira is a climate scientist in the Carnegie Institution
Department of Global Ecology at Stanford University. Damon Matthews
is a climate scientist in the Concordia University Department of
Geography, Planning, and Environment in Montreal, Canada.

The Carnegie Institution (www.CIW.edu) has been a pioneering force in
basic scientific research since 1902. It is a private, nonprofit
organization with six research departments throughout the U.S.
Carnegie scientists are leaders in plant biology, developmental
biology, astronomy, materials science, global ecology, and Earth and
planetary science. The Department of Global Ecology, located in
Stanford, California, was established in 2002 to help build the
scientific foundations for a sustainable future. Its scientists
conduct basic research on a wide range of large-scale environmental
issues, including climate change, ocean acidification, biological
invasions, and changes in biodiversity.

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Starting at 10 this morning on the snowiest day of the year, five students at Ohio
State began a sit-in to demand ethical standards for the purchase of wood and paper.
The members of OSU Free The Planet!, a student group, vow to stay until President
Gordon Gee signs an agreement to stop the University from buying wood products
obtained from Indigenous conflict areas and to include more recycled content in
paper and lumber used on campus.

Forest issues are heavily intertwined with many other issues. The 6-year logging
blockade of the Grassy Narrows people is our struggle too. They are protecting one
of our most valuable tools to combat global environmental devastation, especially
climate change – the Boreal Forest. Our liberation is tied up in theirs.

The 5 students inside are supported by a group of more than two dozen of their
supporters rallying outside the President’s office, who will be standing in
solidarity as long as it takes. Police are reportedly on the scene, but have not
indicated any intent to arrest. Check the Rainforest Action Network’s blog for
updates through the day.

Support the students by signing on to their petition. Free The Planet is also asking
supporters to call the President’s office to encourage him to sign the
agreement: President Gordon E. Gee (like guy except with an ee), The Ohio State
University – (614) 292-2424.

—

Matt/Mattie Reitman

Energy Justice Network Campus and Community Organizer

Campus Climate Challenge Campaigner – Ohio

315.450.6628 matt@energyjustice.net

:::Check out the newly formed Ohio Student Environmental Coalition:::

http://groups.google.com/group/ohio-sec/

http://www.facebook.com/group.php?gid=7461526853

Dispatches from the global youth climate movement

http://www.itsgettinghotinhere.org

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