 This complicated figure comes to us from the US Global Change Research Program, USGCRP, in 2006. And this is a diagram showing an integrated assessment model. And we talk a good bit in the course about what integrated assessment models are and what they do. This is a cartoon of one of them. And what it does is to take natural causes of climate change, but also human causes of climate change, such as CO2 and other things, and ask how do these interact with the ocean, with the land, with the living things, with the atmosphere, with air pollution, and with the things that we grow to eat, the logging we do, and other things to make economic activity that in turn affects so many of these other things. What you end up with out of this are estimates of what is happening to living things, what is happening to the world's climate, and what is happening to the economy as they interact with each other. You should not try to memorize all the pieces of this, but you should see what goes into providing us the knowledge base to make wise decisions about these things.