In the 18,000s civilizations had to worry about much more than we do today. 18,000 people suffered from diseases without medicine, droughts that left no crops to eat, natural disasters that changed the world they lived in, and invasions of others. Today we don't have to worry about much because we have a government that takes care of many things, and even if we have natural disasters, they don't seem as tragic as they were in the past, such as the destruction of entire civilizations. We can't really predict when every single disaster is expected to happen, we could never actually do that. Today we make extensive use of computers and the like to help us research and understand it more. It seems that ancient civilizations, such as the Mayans, Cro-Magnons, Paleo-Indians, Celts, Romans and Chaco-Indians, had problems with themselves. They had difficulty adapting to new environments and climates and were unable to handle natural disasters. It seems that climate change, from cold to hot and vice versa, really affected ancient civilizations and drought was extremely effective for their growth. About 15,000 years ago, a strip of land called Central Beringia once connected Siberia and Alaska. Due to global warming and the warming of the Earth, the bridge has shrunk around the edges causing the sea and waters to rise. The inhabitants of Siberia who lived near the bridge began to move to North America due to the narrowing of the bridge. People believe they were colonized by animals and hunting. This is because when the waters rose, they had to move with them and they moved to places where they knew they could easily find food. The first deal seemed to be sporadic with a messy process, or even no p...... middle of paper ......ps and less food for all of us. From ancient civilizations we should learn that the environment and climate are constantly changing. We think it's always the same but it could easily change every day. In time, it could easily be completely different and we would no longer have any idea where we are. America is more vulnerable due to increased population growth, urbanization, and the industrial revolution (xv). As Fagan states, “In our efforts to protect ourselves from smaller, more frequent climate stresses we have steadily made ourselves more vulnerable to rarer but larger catastrophes.” Fagan means that because we have made our cities and civilizations so close together due to population growth, if a natural disaster were to strike, it would destroy much more than we think. We must study our climate to prepare for these disasters.