William Asher wrote:

qzectb wrote
BW wrote;
I don't buy into the AGW scam, but I think the issue
is whether the 15u CO2 IR absorption actually makes any difference in
surface temperatures, not whether it occurs at all. Evidence is
evidence.

My honest questions to you: Why do you think it's a "scam"? And why
shouldn't altering the radiation balance of the earth make a
difference in surface temperatures, unless you postulate some
mysterious mechanism that exactly cancels its effect?

Now you're going to have to debate the iris hypothesis and, if they're
clued in, the latest Spencer et al. paper in GRL. Just so you know
what's coming next.
hth

Not really, the issues that could make it a scam are the efforts
of some people to make money in some way without actually
providing a legitimate product or service for money solicited.

Nobody ever suggested that the honest professional
scientists who really believe in GW of any kind are the scammers,
so if a scientist not participating in indirect fraud willfully, then
they should not need to be vocally defensive about "scams".