We should aim for an average global temperature of 22 degrees Celsius, which looks like the "normal" temperature. 12 degrees is far too chilly for my liking.
From your graphs, it looks as though we don't have a chance of flipping up to that nice warm temperature without getting CO2 up to at least 1000 ppm.
As you can see, CO2 has been rapidly declining all through the Cretaceous and Tertiary periods, from 2000 ppm all the way down to an all-time low at the start of the industrial revolution.
We were just in time to save the planet from freezing, maybe for the last time.
As you can see, CO2 has been gradually stripped and buried permanently in limestone, shale, coal, gas, bituminous and oil deposits, most of which has been staying stuck, permanently. Over 600 million years, we have gone from a very good level of CO2 at about 6000 parts per million, down to a very thin gruel, barely tolerable for the chlorophyll crowd.
Humans and other animals have NOT been keeping their part of the deal = we are supposed to breathe out enough CO2 to feed the plants. They have been stripping it faster than we can breathe it out. Then we die and a bunch of carbon goes permanently out of the ecosphere. Look at how much is tied up in limestone for example = stupendously huge amounts.
Mqurice |
