There is much to be uncertain about, but one thing we can be relatively certain of is that we are much more uncertain about levels of future carbon dioxide emissions than their potential impacts on the atmosphere. And aren't climate change "skeptics" also people who tend to be very doubtful about our ability to reduce emissions? This point can be laboured a little further, but I will instead turn to what I actually want to discuss: the role of population growth in driving future carbon emissions.
There are now seven billion people living on earth, a number that is inevitably going to increase this century. More people equals more carbon emissions, and in the eyes of some we should be doing much more to stop increases in population.