I am not claiming that all of our recent warming is natural. But the extreme reluctance for most scientists to even entertain the possibility that some of it might be natural suggests to me that climate research has become corrupted.I just don't think that's true. Mainstream climatologists seem to me to be somewhat imprecise on the exact amount of current warming is manmade, and use words like "most." Never "all."
Here's exactly what the IPCC Fourth Assessment Report says:
Most of the observed increase in global average temperatures since the mid-20th century is very likely due to the observed increase in anthropogenic GHG concentrations. It is likely that there has been significant anthropogenic warming over the past 50 years averaged over each continent (except Antarctica).(Emphasis mine.)
I think Roy Spencer is exaggerating, and it doesn't help his cause any.