Even more sophisticated models describe things about snow and ice, and vegetation, all of which effects of climate. Putting all these equations together, as you might imagine, requires a great deal of computer power. Check out the YouTube video in your additional resources to see just how one of these climate models actually works. The largest source of uncertainty in future climate predictions is how various elements of the climate system will interact with each other.These are the feedbacks.And you remember, I gave you a couple of examples of positive feedbacks in the last topic.