Well, BobL, I agree with your conclusion there, but the degree to which warming is anthropogenic is, in my opinion, far less debatable then you seem to be suggesting. Correlation never proves causality (we don't usually deal with proving things in science in any case), but the correlations are so shudderingly convincing that there is an almost 100% consensus in the world of science that we are the primary drivers of the warming. Plenty of people love to sneer at science, of course. Keep your antennae a-twitching for their self-interest being betrayed. As you say (I think), if there is solid evidence that we are causing warming then we have a moral obligation to act, and fast. That applies even if we don't accept the near-certainty or are not comfortable with the level of "proof."