We do have some work to do with regard to what we are going to do to concerning climate change. There is not a scientific consensus in the sense that every scientist agrees with every other scientist on the issue - and there never will be.
I study a system that has been studied for over 40 years: there is still a lot of scientific disagreement and discourse on the matter. There are hypotheses and some seem better than others....some have been proven over time...but, no scientific consensus, per se. That is just something that doesn't really happen.... However, that doesn't mean that there are core ideas about the subject that cannot be generally accepted (although maybe not everyone agrees). This issue is at the heart of climate change.
The problem with climate change is that we are talking as much as a 1% hit on GDP right away to make the cuts necessary. Is that a lot? What would be the cost in the future if we don't act? This is always the problem when scientific issues come to meet socioeconomic concerns....we've got to make some tough decisions and drop the buck (or not) to address the problem (or non-problem).
I have studied the science, and I think that the general warming predictions will bear out, as well as much of the sea level rise predictions most likely. It is always possible that there will be a negative feedback they have missed...and it won't happen...but much do you bank on something like that? The drought and flood scenarios will likely happen - but I kind of wonder if those will ever be definitively separated from normal weather patterns. Then...you will have patterns of El Nino or La Nina that raise or lower temperatures ... and will make it difficult, over short periods, for people to accept warming trends...or perhaps to believe that warming is happening faster than it actually is.
Governments face a very serious risk analysis question...and life-cycle cost question. Do they invest in technologies to curb or limit climate change? I am not an actual scientist who works on climate change, so my opinion doesn't count much ... but I think that we are very close to a point where we will need to make those investments. There are climate scientists who understand a lot about the policy implications of their work..so these decisions won't be made in a vacuum.