dence. This is a chart that is very similar. It shows carbon dioxide 
levels again in the red line and temperatures in the blue only it goes 
back 400,000 years. It takes us back further in time. And what we see 
is that 400,000 years ago we were about 250 and the red line went down 
and went up and went down and it went down and it went up. And you will 
notice corresponding changes in the temperature at the same time. When 
carbon dioxide has gone down, the average temperatures have gone down. 
Notice we 