You are right climate change also cause different issues of health, diseases, food production and consumption, environmental changes, clothing change and many more things.
All these factors play an important role in the life of people and such the whole civilizations turned changed.
Is that the case for specific regions or for the whole civilization in general? because I think this is a little exaggerated^^ I'm not saying this won't be the case one day, I just don't like unnecessary panicing too much
I'd like to add a resource to this thread, think this is interesting for some of you...some stats and facts abour the climate change:
http://www.statista.com/topics/1148/global-climate-change/
best regards!