It seems to me
that quite a bit of global warming is clearly anthropogenic. It is all the hot air emanating from politicians and commentards alike. Most models fail to take that into account
On a serious note, I do not know (i.e. with 100.0000% scientific certainty) whether global warming or climate change is anthropogenic or not. Climate has changed a lot over earth's history, and CO2 levels are quite low at the moment, as compared to the mesozoic era AFAIK. It is also rather cold compared to e.g. the Jurassic. That suited a bunch of big lizards (OK, not really lizards), but not our current society, which has adapted to the current climate. Climate change may therefore disrupt our cosy lifestyle. To me it does not matter so much whether we are to blame. It is more important to see how we can get by, using fewer non-renewable resources, and how we can deal with a potential crisis, preferably without bloodshed. Mankind's performance in the latter case is not stellar, I agree, but maybe we can work things out this time.
Just my tuppence