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Forget auto emissions and power plants. Humans may have contributed to climate change more than 10,000 years ago, according to a new study.
"Some people say that people are unable to affect the climate, that it's just too big...That's obviously not the case. People started to affect global climate much earlier than we thought."
The research...revealed that the extinction of woolly mammoths — driven in part by human hunting — may have caused changes in vegetation that, in turn, warmed Siberia and neighboring Beringia by about 0.3 to 0.4 degrees Fahrenheit
Cirrus Disappearance: Warming Might Thin Heat-Trapping Clouds
ScienceDaily (Nov. 5, 2007) — The widely accepted (albeit unproven) theory that manmade global warming will accelerate itself by creating more heat-trapping clouds is challenged this month in new research from The University of Alabama in Huntsville.
"All leading climate models forecast that as the atmosphere warms there should be an increase in high altitude cirrus clouds, which would amplify any warming caused by manmade greenhouse gases," he said. "That amplification is a positive feedback. What we found in month-to-month fluctuations of the tropical climate system was a strongly negative feedback. As the tropical atmosphere warms, cirrus clouds decrease. That allows more infrared heat to escape from the atmosphere to outer space."
Koutsoyiannis, D., A. Efstratiadis, N. Mamassis, and A. Christofides, On the credibility of climate predictions, Hydrological Sciences Journal, 53 (4), 671–684, 2008.
Geographically distributed predictions of future climate, obtained through climate models, are widely used in hydrology and many other disciplines, typically without assessing their reliability. Here we compare the output of various models to temperature and precipitation observations from eight stations with long (over 100 years) records from around the globe.
The results show that models perform poorly, even at a climatic (30-year) scale. Thus local model projections cannot be credible, whereas a common argument that models can perform better at larger spatial scales is unsupported.
Abstract Observations from the International Satellite Cloud Climatalogy Project (ISCCP) are used to demonstrate that the 19-level HadAM3 version of the United Kingdom Met Office Unified Model does not simulate sufficient high cloud over land. By using low-altitude winds, from the European Centre for Medium Range Weather Forecasting (ECMWF) Re-Analysis from 1979 to 1994 (ERA-15) to predict the areas of maximum likelihood of orographic wave generation, it is shown that much of the deficiency is likely to be due to the lack of a representation of the orographic cirrus generated by sub-grid scale orography. It is probable that this is a problem in most GCMs.
Originally posted by Three_moons
"Some people say that people are unable to affect the climate, that it's just too big...That's obviously not the case. People started to affect global climate much earlier than we thought."
The research...revealed that the extinction of woolly mammoths — driven in part by human hunting — may have caused changes in vegetation that, in turn, warmed Siberia and neighboring Beringia by about 0.3 to 0.4 degrees Fahrenheit.
Originally posted by Outland
The image below illustrates to scale all of the GHGs in the atmosphere rounded up to 400PPM (0.04%) -not including water vapor- as indicated by the red area.
Compare that with atmospheric oxygen for perspective...
Compare that to nitrogen for perspective...
Of that 0.04% of GHGs, the gray part of the magnified red area is human based...
I hope you're all feeling really guilty now.
Entire Islands Composed of the Bones of Frozen Animals
Originally posted by Tayesin
What it meant was that the ecosystem of our world is already working at maximum efficiency, Yes? Humans come along and begin to add man made pollutants to that.. I estimate to be around 10% additonal input to the norm.
...
Originally posted by CynicalM
Sheesh, now I understand..
Santa Clause is Chinese and set up a HUGE factory at the North Pole.
Its powered by coal fired generators and thats why the poles are melting!!!!
Now I know why some religions don't do xmas...