It really is time the powers that be admitted that any climate change is natural and their scaremongering is another excuse for more tax.
I hear this all the time in our house; every time some news person utters the words "global warming" or "climate change".
And so I decided to do a little carbon homework. A search of the internet turned up the following figures. Please feel free to correct them --
The atmosphere contains about 0.001% of Earth's carbon. That's not a lot. There is another 0.001% in living plants (other life forms are insignificant) and 0.0025% in the ground as rotting plant, the stuff gardeners call humus. From this it is clear that a change in the total mass of plant life will cause a much larger change in the mass of atmospheric CO2. Cutting down trees is a BAD THING!
We should be planting them wherever they will grow.
Now we come to the long dead organisms that are fossil fuels. These contain about 0.006% of our carbon. That's still tiny but it's a lot more than all the carbon in plants, humus and atmosphere put together. It doesn't take a genius to see that if we dig it all out and burn it without a second thought, which is exactly what we have been doing, there will be trouble!
If your maths is any good, you'll have noticed that a lot of carbon has not yet been accounted for. The oceans contain a huge amount of carbon, mostly in the form of soluble carbonates and bicarbonates. At 0.06%, this store of carbon dwarfs all the organic sources - but where is the rest?
The answer is under your feet. Almost all of Earth's carbon is in the ground as carbonate rock - and it moves! It will ultimately be dragged down towards the mantle where it will melt and mix with SiO2. Result: silicate rock and CO2. The good news is that this is a VERY slow process. The bad news is that we haven't got a hope in hell of controlling it. Even with Star Trek grade technology, it's not obvious that we should even try to halt continental drift.
What we can, and probably should, do is speed up carbonate rock formation. If we are hell bent on burning every last million tons of fossil carbon, our only real option is to put it back as carbonate afterwards, or --
We could leave it where it is and move as quickly as we can to a fossil fuel free future. Now, does anybody know how much deuterium we've got left?