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U.S. Experts Insist Global Warming Not Man-Made
Sunday, December 16, 2007 9:31 PM
Agence France Presse.
WASHINGTON -- A small group of US experts stubbornly insist that,
contrary to what the vast majority of their colleagues believe, humans
may not be responsible for the warming of the planet Earth.
These experts believe that global warming is a natural phenomenon, and
they point to reams of data they say supports their assertions.
These conclusions are in sharp contradiction to those of the United
Nations Intergovernmental Panel on Climate Change (IPCC), which
reached its conclusions using largely similar data.
The UN body of about 3,000 experts, including several renown US
scientists, jointly won the award with former US vice president Al
Gore for their work to raise awareness about the disastrous
consequences of global warming.
In mid-November the IPCC adopted a landmark report stating that the
evidence of a human role in the warming of the planet was now
"unequivocal."
Retreating glaciers and loss of snow in Alpine regions, thinning
Arctic summer sea ice and thawing permafrost shows that climate change
is already on the march, the report said.
Carbon pollution, emitted especially by the burning of oil, gas and
coal, traps heat from the Sun, thus warming the Earth's surface and
inflicting changes to weather systems.
A group of US scientists however disagree, and have written an article
on their views that is published in The International Journal of
Climatology, a publication of Britain's Royal Meteorological Society.
"The observed pattern of warming, comparing surface and atmospheric
temperature trends, doesn't show the characteristic fingerprint
associated with greenhouse warming," wrote lead author David Douglas,
a climate expert from the University of Rochester, in New York state.
"The inescapable conclusion is that human contribution is not
significant and that observed increases in carbon dioxide and other
greenhouse gases make only a negligible contribution to climate
warming," Douglas wrote.
According to co-author John Christi from the University of Alabama,
satellite data "and independent balloon data agree that the
atmospheric warming trends do not exceed those of the surface," while
greenhouse models "demand that atmospheric trend values be two to
three times greater."
Data from satellite observations "suggest that greenhouse models
ignore negative feedback produced by clouds and by water vapor, that
diminish the warming effects" of human carbon dioxide emissions.
The journal authors "have good reason, therefore, to believe that
current climate models greatly overestimate the effects of greenhouse
gases."
For Fred Singer, a climatologist at the University of Virginia and
another co-author, the current warming "trend is simply part of a
natural cycle of climate warming and cooling that has been seen in ice
cores, deep sea sediments and stalagmites . . . and published in
hundreds of papers in peer reviewed journals."
How these cyclical climate take place is still unknown, but they "are
most likely caused by variations in the solar wind and associated
magnetic fields that affect the flux of cosmic rays incident on
cloudiness, and thereby control the amount of sunlight reaching the
earth's surface and thus the climate."
Singer said at a recent National Press Club meeting in Washington that
there is still no definite proof that humans can produce climate
change.
The available data is ambiguous, Singer said: global temperatures, for
example, rose between 1900 and 1940, well before humans began to burn
the enormous quantities of hydrocarbons they do today. Then they
dropped between 1940 and 1975, when the use of oil and coal increased,
he said.
Singer believes that other factors -- like variations of solar winds
and terrestrial magnetic field that impact cloud formations and the
amount of sunlight reaching the Earth's surface, and thus determining
the temperature -- are much more influential than human-generated
greenhouse gas emissions.
Copyright
Sunday, December 16, 2007 9:31 PM
Agence France Presse.
WASHINGTON -- A small group of US experts stubbornly insist that,
contrary to what the vast majority of their colleagues believe, humans
may not be responsible for the warming of the planet Earth.
These experts believe that global warming is a natural phenomenon, and
they point to reams of data they say supports their assertions.
These conclusions are in sharp contradiction to those of the United
Nations Intergovernmental Panel on Climate Change (IPCC), which
reached its conclusions using largely similar data.
The UN body of about 3,000 experts, including several renown US
scientists, jointly won the award with former US vice president Al
Gore for their work to raise awareness about the disastrous
consequences of global warming.
In mid-November the IPCC adopted a landmark report stating that the
evidence of a human role in the warming of the planet was now
"unequivocal."
Retreating glaciers and loss of snow in Alpine regions, thinning
Arctic summer sea ice and thawing permafrost shows that climate change
is already on the march, the report said.
Carbon pollution, emitted especially by the burning of oil, gas and
coal, traps heat from the Sun, thus warming the Earth's surface and
inflicting changes to weather systems.
A group of US scientists however disagree, and have written an article
on their views that is published in The International Journal of
Climatology, a publication of Britain's Royal Meteorological Society.
"The observed pattern of warming, comparing surface and atmospheric
temperature trends, doesn't show the characteristic fingerprint
associated with greenhouse warming," wrote lead author David Douglas,
a climate expert from the University of Rochester, in New York state.
"The inescapable conclusion is that human contribution is not
significant and that observed increases in carbon dioxide and other
greenhouse gases make only a negligible contribution to climate
warming," Douglas wrote.
According to co-author John Christi from the University of Alabama,
satellite data "and independent balloon data agree that the
atmospheric warming trends do not exceed those of the surface," while
greenhouse models "demand that atmospheric trend values be two to
three times greater."
Data from satellite observations "suggest that greenhouse models
ignore negative feedback produced by clouds and by water vapor, that
diminish the warming effects" of human carbon dioxide emissions.
The journal authors "have good reason, therefore, to believe that
current climate models greatly overestimate the effects of greenhouse
gases."
For Fred Singer, a climatologist at the University of Virginia and
another co-author, the current warming "trend is simply part of a
natural cycle of climate warming and cooling that has been seen in ice
cores, deep sea sediments and stalagmites . . . and published in
hundreds of papers in peer reviewed journals."
How these cyclical climate take place is still unknown, but they "are
most likely caused by variations in the solar wind and associated
magnetic fields that affect the flux of cosmic rays incident on
cloudiness, and thereby control the amount of sunlight reaching the
earth's surface and thus the climate."
Singer said at a recent National Press Club meeting in Washington that
there is still no definite proof that humans can produce climate
change.
The available data is ambiguous, Singer said: global temperatures, for
example, rose between 1900 and 1940, well before humans began to burn
the enormous quantities of hydrocarbons they do today. Then they
dropped between 1940 and 1975, when the use of oil and coal increased,
he said.
Singer believes that other factors -- like variations of solar winds
and terrestrial magnetic field that impact cloud formations and the
amount of sunlight reaching the Earth's surface, and thus determining
the temperature -- are much more influential than human-generated
greenhouse gas emissions.
Copyright
