If negative global climate change is caused by man then man could conceivably have the power to alter climate to his liking.
Of course that would require men (or at least a man) who knows what temperature is best at any given point in time at every point on earth. To know that would require an infinite knowledge of the world and space around us as well as the ability to see what the future holds.
Once it was determined what changes were required to obtain the optimal state of the climate, of all the possible states – the force of a global authority – more powerful than any earthy ruler before would be required to move all of society as a single unit toward a single climate goal. Such a legion of super rulers would need to control every facet of production and consumption globally (for our own good of course). A socialist utopia of sorts.
All kinds of drastic steps – like eugenics – may seem like positive and proactive steps to someone who believed in a looming planetary disaster.
However, if climate change follows natural cyclical patterns which have nothing to do with the behavior of men, then the wise man would view the hysteria surrounding man-made climate change as nothing more than a scheme of a small portion of the political elite to control and subdue mankind under a one world government.