This is why we spent so much time in the previous chapter on evaluating historic correlations between CO2 and temperature. (climate-skeptic.com)
Canadian yields have been rising too, for no apparent reason other than the assumption that the historic correlation between the Canadian and U.S. economies still holds. (canadianbusiness.com)
The best evidence we could expect to find (lacking a second identical Earth we can use as a control in an experiment) is to find a historic correlation between temperature and CO2 that is stronger than the correlation between temperature and anything else (and of course, even this would not imply causation). (climate-skeptic.com)