The hockey stick shows a sudden unprecedented warming starting about 150 years ago, which is implicitly blamed on humans.
The only problem is – nothing humans did 150 years ago could have caused this. CO2 didn’t start rapidly rising until much later. Phil Jones has attributed the 1860-1880 and 1910-1940 warming to natural causes, like the sun.
Jones says that most of the rise since 1860 was due to natural causes – which can mean only one of two things
- Something radically changed in the climate system around 150 years ago.
- The hockey stick temperature reconstruction is garbage
The first possibility is absurd, which leaves only #2 – the hockey stick is garbage. There is no reason to believe that the last third of the warming is any different than the first two thirds.
Two thirds of the hockey stick is natural. Yet another peer-review parody of science.