As far as practical impacts on human existence go, the effects of climate change are pretty well-documented. We're expecting that global warming will produce higher rates of human mortality, for example, and climate change is also creating a more ideal environment for the spread of parasitic diseases, which is obviously not great for human health. And, thanks to the fact that the climate has changed before, we have insight into the damage it wrought on previous civilizations. But what about the ways climate change will affect human behavior?
I'm not just talking about the choices we'll have to make in response to climate change, like higher rates of migration as water levels rise and various places become unviable for human habitation; I mean the ways in which we react to one another, our environments, and our own mental procedures.
Various species have already been observed to change the way they behave in response to shifts in their environment due to climate change. Some birds, for instance, are changing the way they choose their partners, which is an interesting thought: are humans likely to shift what they find attractive as the globe warms? There's no sign of that just yet; but there are certain ways in which human behavior does seem to be affected by climate change, and they're very interesting. And scary. Don't forget scary.