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Originally posted by mc_squared
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and easily debunkable but constantly rehashed simpleton memes to perpetually derail this conversation into anything BUT a scientific one.
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Skeptic Argument vs What the Science Says
1 "Climate's changed before" Climate reacts to whatever forces it to change at the time; humans are now the dominant forcing.
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2 "It's the sun" In the last 35 years of global warming, sun and climate have been going in opposite directions
Since the late 1970s, the amount of solar radiation the sun emits, during times of quiet sunspot activity, has increased by nearly .05 percent per decade, according to a NASA funded study.
"This trend is important because, if sustained over many decades, it could cause significant climate change," said Richard Willson, a researcher affiliated with NASA's Goddard Institute for Space Studies and Columbia University's Earth Institute, New York. He is the lead author of the study recently published in Geophysical Research Letters.
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In this study, Willson, who is also Principal Investigator of NASA's ACRIM experiments, compiled a TSI record of over 24 years by carefully piecing together the overlapping records. In order to construct a long-term dataset, he needed to bridge a two-year gap (1989 to 1991) between ACRIM1 and ACRIM2. Both the Nimbus7/ERB and ERBS measurements overlapped the ACRIM 'gap.' Using Nimbus7/ERB results produced a 0.05 percent per decade upward trend between solar minima, while ERBS results produced no trend. Until this study, the cause of this difference, and hence the validity of the TSI trend, was uncertain. Willson has identified specific errors in the ERBS data responsible for the difference. The accurate long-term dataset, therefore, shows a significant positive trend (.05 percent per decade) in TSI between the solar minima of solar cycles 21 to 23 (1978 to present). This major finding may help climatologists to distinguish between solar and man-made influences on climate.
NASA's ACRIMSAT/ACRIM3 experiment began in 2000 and will extend the long-term solar observations into the future for at least a five-year minimum mission.
Although not documented here, it is interesting to note that the overall level of magnetic disturbance from year to year has increased substantially from a low around 1900 Also, the level of mean yearly aa is now much higher so that a year of minimum magnetic disturbances now is typically more disturbed than years at maximum disturbance levels before 1900.
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"It's not bad" Negative impacts of global warming on agriculture, health & environment far outweigh any positives.
Successful indoor growers implement methods to increase CO2 concentrations in their enclosure. The typical outdoor air we breathe contains 0.03 - 0.045% (300 - 450 ppm) CO2. Research demonstrates that optimum growth and production for most plants occur between 1200 - 1500 ppm CO2. These optimum CO2 levels can boost plant metabolism, growth and yield by 25 - 60%.
"It's cooling" The last decade 2000-2009 was the hottest on record.
5 "There is no consensus" 97% of climate experts agree humans are causing global warming.
6 "Models are unreliable" Models successfully reproduce temperatures since 1900 globally, by land, in the air and the ocean.
Originally published in Science Express on 19 June 2008
Science 1 August 2008:
Vol. 321. no. 5889, pp. 680 - 684
DOI: 10.1126/science.1157707
Prev | Table of Contents | Next
Reports
High-Resolution Greenland Ice Core Data Show Abrupt Climate Change Happens in Few Years
Jørgen Peder Steffensen,1* Katrine K. Andersen,1 Matthias Bigler,1,2 Henrik B. Clausen,1 Dorthe Dahl-Jensen,1 Hubertus Fischer,2,3 Kumiko Goto-Azuma,4 Margareta Hansson,5 Sigfús J. Johnsen,1 Jean Jouzel,6 Valérie Masson-Delmotte,6 Trevor Popp,7 Sune O. Rasmussen,1 Regine Röthlisberger,2,8 Urs Ruth,3 Bernhard Stauffer,2 Marie-Louise Siggaard-Andersen,1 Árn E. Sveinbjörnsdóttir,9 Anders Svensson,1 James W. C. White7
The last two abrupt warmings at the onset of our present warm interglacial period, interrupted by the Younger Dryas cooling event, were investigated at high temporal resolution from the North Greenland Ice Core Project ice core. The deuterium excess, a proxy of Greenland precipitation moisture source, switched mode within 1 to 3 years over these transitions and initiated a more gradual change (over 50 years) of the Greenland air temperature, as recorded by stable water isotopes. The onsets of both abrupt Greenland warmings were slightly preceded by decreasing Greenland dust deposition, reflecting the wetting of Asian deserts. A northern shift of the Intertropical Convergence Zone could be the trigger of these abrupt shifts of Northern Hemisphere atmospheric circulation, resulting in changes of 2 to 4 kelvin in Greenland moisture source temperature from one year to the next.
Originally posted by Sparky63
I left the Church of Al Gore when I realized that politicians stood to make a buttload of money with carbon credits.
My suspicions were then validated when all the stories of fraud and lies began to surface in the scientific community.
Originally posted by Chett
So I guess everybody missed the recent bit that the sun is going into a minimum and we are likely headed for an ice age? I don't like cold much, lets make a bit more co2 and see if it helps
Originally posted by Chett
So I guess everybody missed the recent bit that the sun is going into a minimum and we are likely headed for an ice age? I don't like cold much, lets make a bit more co2 and see if it helps