We're going to have to learn how to deal with natural climate change. Dealing with added human-caused acceleration is a difference of degree compared to what we would have to be doing anyway, not of type. Ancient peoples faced climate fluctuations on a timescale of just within a few hundred years so much change that populations would crash and farmland go into decay: https://www.youtube.com/watch?v=iVqjKpTvpM8&t=1323s