Monday, December 17, 2007

Climate Change Not Caused By Humans Say Experts

WASHINGTON (AFP) - An ever growing 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 actual experts on the topic believe that global warming is a natural phenomenon, and they point to reams of data they say supports their assertions. Unlike Al Gore, they have degrees in this field of study.

These conclusions are in sharp contradiction to those of the United Nations politisized Intergovernmental Panel on Climate Change (IPCC), which reached its conclusions before looking at the 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. However, Al Gore's movie has been found to have multiple scientific errors.

Thier theory is that 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 who are experts 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.

1 comment:

dclh said...

Just like human, getting a fever is uncomfortable, and factually body temperature have rised. However, is it caused by the baterial/viruses, or by our immune system?
The problem is not the rejection of facts, e.g. temperature increases, but questioning of the main cause, which will hardly become a proven fact, even with tremendous evidence.