Global Warming Convergence

Is global warming real? Up to now there had been a difference between surface temperature measurements
and satellite temperature measurements with surface temperature measurements coming in at 0.2 degrees
per decade and satellite temperature measurements showing 0.09 degrees per decade.

But now Roy Spencer reports that anomalies in the measurements from satellites
indicate that the satellite temperature series comes in much closer to the surface series.

Which indicates that “global warming is real.” So now the question is:

"how much has it warmed, and how much will it warm in the future?".
(Equally valid questions to debate are "how much of the warmth is man-made?",
"is warming necessarily a bad thing?",
and "what can we do about it anyway?").