Quote:
Originally Posted by zuluking
It doesn't rule out AGW as being a factor. I didn't say that. It does show warming of the ocean as having started long before AGW would have been a concern.
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When would have AGW become a concern? It was identified as a potential problem at least 100 years ago.
http://new.globalwarmingart.com/imag.../Arrhenius.pdf
Arrhenius’s paper (1896) is the first to quantify the contribution of carbon dioxide to the greenhouse effect (Sections I-IV) and to speculate about whether variations in the atmospheric concentration of carbon dioxide have contributed to long-term variations in climate (Section V). Throughout this paper, Arrhenius refers to carbon dioxide as “carbonic acid” in accordance with the convention at the time he was writing.
Contrary to some misunderstandings, Arrhenius does not explicitly suggest in this paper that the burning of fossil fuels will cause global warming, though it is clear that he is aware that fossil fuels are a potentially significant source of carbon dioxide (page 270), and he does explicitly suggest this outcome in later work.
http://www.aip.org/history/climate/co2.htm#S1
I don't know when mad-made CO2 became a significant factor. The last link suggests:
As seen in hundreds of thousands of measurements analyzed by three independent groups, it began a steady rise in the 1970s. That was just when greenhouse gas levels reached a level high enough to be important: