Say what you want about Lomborg's books (and there is lot to say, no doubt), but there is at least one point he makes that is worth thinking about more carefully:
Wether we know or not how global warming really works, to me the bigger issue is that we are rapidly depleting resources and polluting/screwing up our planet - on so many levels that it is not funny. We have been doing so much crap at such a rapid pace that Lomborg is probably right when he says that we simply won't be able to pay our way out of this mess. And that includes all nations, not just the rich and/or polluting ones.
As a result, you have to do two things: reduce doing crap (again, on many levels), and pay for those solutions to reduce/reverse bad developments that make the most impact. And solutions making the most impact may not necessarily be the "feel good" solutions.
Even though this may seem wrong to many, adding some economic common sense to the whole debate (as Lomborg proposes) makes sense to me, if done right.
Frankly, I don't really care whether humankind is capable of changing the climate and generally screwing things up, because on a fundamental level I believe we simply should not. If we think/know that we are, we should get our act together and try the most effective ways of counteracting those developments. It will be hard. But we certainly know how not pollute etc., if we really wanted to.
Beyond that, the religious wars of who is right when and where really just bore me. All it does is giving people a reason not to do something sensible and productive. Such is humankind, I suppose ...