For all you global warming fools out there. I have some SPF 1000 sunscreen for you. It costs about $450 billion (the cost of the new cap/trade bill). In all seriousness this a simple model of the law of diminishing returns. Unless you can make a good case for amplification and positive feed back doubling our current levels of carbon dioxide will make only small differences in temperature. Of course there is no way that our climate has substantial positive feedback with carbon dioxide. Evidence? The earth has experienced significantly higher levels in the past (in excess of 10x higher) without creating a run away greenhouse effect which would be the result of high gain positive feedback.
For those of you who have trouble with math…..
SPF % passage % absorbed
1 100.0 0.0
2 50.0 50.0
4 25.0 75.0
8 12.5 87.5
15 6.7 93.3
30 3.3 96.7
60 1.7 98.3
100 1.0 99.0
200 0.5 99.5
500 0.2 99.8
1000 0.1 99.9
