The rate of temperature increase now is much more dramatic than back then, I don't think there can be any dispute about the measurements. What I don't think we will know for at least a couple of decades is how much human activity is contributing to the rate of warming or whether or not we have broken the natural feedback loop that allows the climate to stay within habitable bounds. So, it makes sense to me to try and do as much as possible to reduce the contribution that we may be making to global warming just in case we are tipping the balance beyond the pont of no-return as we won't know for sure until long after that point has been passed (if it is passed).