I certainly believe in man-made global warming in this case, where someone has tinkered with raw weather station data to create an artificial warming trend. As Paul Homewood explains:
Before After (click to enlarge)
Not content with reducing past temperatures in the Arctic thus creating an artificial warming trend, GHCN have now been up to their tricks in Alice Springs down under in Oz.
A sharp drop in temperatures in 1976, confirmed in B.O.M. records, seems to have convinced the algorithm that adjustments were needed. The odd thing is that a similar rise in temperature in the following year did not do the same.
Other stations near to Alice show a similar drop in temperatures that year proving that it was not an anomalous reading, e.g. Jervois, the nearest station.
The adjustment has been slipped into the latest update, last week, unlike the Arctic ones which appeared in December. Evidently GHCN are still fiddling around with their software.
I have contacted the Ozzie Met for their comments. However, it is apparent that the latest version of GHCN is rapidly becoming a joke.