01-26-2007
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President
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Member Since: Feb 2004
Location: Midwest US
Posts: 11,409
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Re: Ski resorts affected by climate change
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Originally Posted by Cato
Is ten years really an effective time frame to base geologic conclusions upon?
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Al-Gore claimed that we only had 10 years Left. But, that was like 8 years ago or something. We are doomed.
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Originally Posted by Cato
CO2 concentrations fluctuate naturally. Therefore, there must be some mechanism by which CO2 concentrations increase naturally. Therefore, it is possible that CO2 concentrations are increasing naturally. Definitive statements like the one I quoted are therefore false.
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It's good someone recognizes that co2 is not exclusively human manufactured.
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Originally Posted by Cato
Furthermore, you're arguing that CO2 concentrations are increasing because humans are emitting CO2. You argue that nature sequesters more CO2 than it emits, and further claim that this is because there is "extra" CO2 in the atmosphere. You then conclude, erroneously, that were there no human emissions, CO2 concentrations would fall. This conclusion does not follow from your premises.
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Co2 rose to 2,000 bits per million naturally in the past.
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300 million years ago, the Earth was in an ice age. Miles-thick ice sheets covered much of the southern continent, and floating pack ice likely covered the northern polar ocean.
Forty million years later, all the ice was gone. The world was a hot, dry place, vegetation was sparse, soils little more than drifts of wind-blown dust. The new data show that throughout millions of years, atmospheric carbon dioxide levels swung back and forth between about 250 parts per million, close to present-day levels, to more than 2,000 parts per million.
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Quote:
Originally Posted by Cato
In reality, you can't say with any certainty why CO2 concentrations are increasing, nor whether removing human emissions would have either a positive or negative net effect.
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Exactly. Besides, there are other factors to consider as well.
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Sun's Output Increasing in Possible Trend Fueling Global Warming
In what could be the simplest explanation for one component of global warming, a new study shows the Sun's radiation has increased by .05 percent per decade since the late 1970s.
The increase would only be significant to Earth's climate if it has been going on for a century or more, said study leader Richard Willson, a Columbia University researcher also affiliated with NASA's Goddard Institute for Space Studies.
The Sun's increasing output has only been monitored with precision since satellite technology allowed necessary observations. Willson is not sure if the trend extends further back in time, but other studies suggest it does. "This trend is important because, if sustained over many decades, it could cause significant climate change," Willson said.
In a NASA-funded study recently published in Geophysical Research Letters, Willson and his colleagues speculate on the possible history of the trend based on data collected in the pre-satellite era. "Solar activity has apparently been going upward for a century or more," Willson told SPACE.com today.
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United We Stand.
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