The wise amongst us, incidently most of the happier people live there, are more concerned about global cooling happening. It will happen overnight relatively) just as it always has. When the Earth becomes akin to a dirty snowball in space the population issue will most certainly solve itself. We could cope with rising temperatures, we would cope with a total ice melt, we will not survive an ice age. Particularly when we have destroyed any means to cope with such a cooling. A massive volcanic eruption, or seies of them along a tectonic plate, Solar events or Nuclear war would set just such a chain of events into being. Frozen windmills, hydroelectric generators, and snow covered solar panels will not help. Reduced levels of Carbon Dioxide will stunt all plant growth(all plants thrive indeed need carbon dioxide to live) in areas least affected by the freezing temperatures and prevent any chance of a quick recovery. As we speak a volcano is releasing more "toxic gas and climate destroying gas than the rest of the World's industries combined. It does not look like stopping any time soon. Instead of just "doing something" in a vain demonstration of being in charge, or caring more than the insensitive "others" we should be investing in coping with what is real. We wouldn't even have the power to extract the underground fuel that we now despise when it would be the only thing that could save us. Frittering resources away on a flawed hypothesis will not save the World. Quite the oposite.
Cheer up though ... the nutters haven't got complete control yet.