For all the hype about global warming and its impact on hurricanes, the plain fact is that 1200 years ago, the surface waters of the Gulf of Mexico were warmer than they are today. That means, that the Native Americans probably experienced the 'worse hurricanes' which the global warming hysteriacs think we will experience this century--and they didn't all die out.
But, it isn't just the Gulf of Mexico where the recent past experienced higher sea surface temperatures. Consider the picture below which is taken from the southern oceans. All the sites show that about 10,000 years ago, the sea surface temperatures where higher than they are at present. Global warming hysteriacs simply don't look at the science of geology. They only look at their thermometers for the last 100 years.