Well, I had hoped for the best from BEST, the new Berkeley Earth Surface Temperature project looking at the global temperature record. I was disheartened, however, by the Congressional testimony
of Dr. Richard Muller of BEST.
He said (emphasis mine):
Prior groups at NOAA, NASA, and in the UK (HadCRU) estimate about a 1.2 degree C land temperature rise
from the early 1900s to the present. This 1.2 degree rise is what we call global warming. Their work is excellent, and the Berkeley Earth project strives to build on it.
Human caused global warming is somewhat smaller. According to the most recent IPCC report (2007), the human component became apparent only after 1957, and it amounts to “most” of the 0.7 degree rise since then
. Let’s assume the human-caused warming is 0.6 degrees.