People have offered many suggestions for dealing with climate change. There have been international political agreements, and there have been attempts at market based solutions. Some have suggested the problem lies closer to home, that recycling or driving a hybrid are ways to help. And then there is one you probably have not heard yet: Make the next generation of children shorter so they consume less. This is one of the options discussed in a new academic paper which has set off a storm of criticism. In “Human Engineering and Climate Change,’’ a group of three scholars consider ways of using science to alter the human body in order to divert the Earth from its march to slow boil -- to drought, coastal flooding, extreme weather and all the rest. A good number of the possibilities they put forward are indeed horrific, and the whole conversation surrounding it has a dystopian, totalitarian feel.