Trevor Breusch and Farshid Vahid from ANU do just that in a working paper published at the end of July.
I think it tells us that global warming is real. Or does it?
GLOBAL TEMPERATURE TRENDS [PDF]
Are global temperatures on a warming trend? It is difficult to be certain about trends when there is so much variation in the data and very high correlation from year to year. We investigate the question using statistical time series methods. Our analysis shows that the upward movement over the last 130-160 years is persistent and not explained by the high correlation, so it is best described as a trend. The warming trend becomes steeper after the mid-1970s, but there is no signi…cant evidence for a break in trend in the late 1990s. Viewed from the perspective of 30 or 50 years ago, the temperatures recorded in most of the last decade lie above the confi…dence band of forecasts produced by a model that does not allow for a warming
So let us cut past the equations and pictures and get to the meat. What is the conclusion?
We conclude that there is sufficient evidence in temperature data in the past 130-160 years to reject the hypothesis of no warming trend in temperatures at the usual levels of signifi…cance. The evidence of a warming trend is present in all three of the temperature series and it is most pronounced in NASA’s GLB series. Although we have used unit roots and linear trends as a coordinate system to approximate the high persistence and the drift in the data in order to answer the questions, we do not claim that we have uncovered the nature of the trend in the temperature data. There are many mechanisms that can generate trends and linear trends are only a …rst order approximation (see Granger 1988). It is impossible to uncover detailed trend patterns from such temperature records without corroborating data from other sources and close knowledge of the underlying climate system.
So........global warming is real but is it caused by mankind's exploitation of the earth's resources and relentless pursuit of growth at all costs or is it just kind of happening as part of the natural ebb and flow of the earths atmosphere over millions of years? Will mankind survive long enough to find out the answer?