Climate has always changed. 10,000 years ago sea levels were so low that it was possible to walk to the mainland Europe from the UK

The tide of opinion is moving against AGW,  and certainly against CO2, being particularly potent cause of climate change.    
Rather than surveying scientists, look at the fundamentals.  Effects of water are dominant over CO2.   I’m told that IPCC models apply controversial positive feedback factors to enhance the effect of CO2, and using values that are too high would explain why their models do not fit recent observations.  Illustrative links follow: -

Water vapour dominates.
http://timeforchange.org/radiation-wavelength-and-greenhouse-effect
Beyond thst, clouds complicate the effects of water, which in a complete study needs to be considered in its three phases.

However, global mean temperature does not correlate with atmospheric CO2 concentration on a geological time scale:
http://www.paulmacrae.com/?p=62

nor using accurate modern data:
http://www.c3headlines.com/2012/06/global-warming-science-facts-cooling-hadcrut-ipcc-gold-standard.html

You don’t have to accept the above graphs.  You can do your own research.  However, I expect that you will find that that they do illustrate the points succinctly and that you will confirm them.

I do appreciate that a huge range effects with differing time-constants involved in determining climate, and that there are significant statistical uncertainties.

One needs to go into far greater detail, but that’s it in a nutshell.  For a proper debate one would need to go beyond the scope of the article.