What could climate instability mean to you?

Since humans began settling down and building civilizations 10,000 years ago, the Earth's climate has been relatively stable. But before that, the climate was more unstable - unpredictable - and humans were nomads, forced to follow the good climate for food and shelter. Today, the global average temperature is higher than it has ever been since the beginning of civilization. What does this mean for the future of human civilization? Could this mean a return to instability? Can we make civiliza...