Because the
total amount of carbon in the atmosphere is the sum of the natural contributions plus the contribution from anthropogenic sources, the same observation would apply to the graph in the AR5.
Carbon dating is notoriously inaccurate when extreme conditions have occurred — volcanoes erupting, extreme heat — any extreme events that can «contaminate» the sample with carbon from an external source or significantly change
the amount of carbon in the atmosphere.
And if the permafrost melts entirely, there would be five times
the amount of carbon in the atmosphere than there is now, said Jeff Chanton, the John Widmer Winchester Professor of Oceanography at Florida State.
Clearly, governments will have to call a halt at some point, and stabilise
the amount of carbon in the atmosphere.
Since 1956, when the monitoring of atmospheric CO2 concentrations began at Mauna Loa Observatory (MLO), many more stations have been added to measure
the amount of carbon in the atmosphere and how it varies seasonally and geographically.
Soils are the largest land - based reservoir of organic carbon on the planet, storing around 1,500 billion metric tons of organic carbon — about twice
the amount of carbon in the atmosphere.
b)
The amount of carbon in the atmosphere that is greater than the 1850 level in the atmosphere of 165 + / - 4 GT as of 1994.
Notice that nothing of the above is an issue of
the amount of carbon in the atmosphere.
Now, as the use of fossil fuels spreads through the world,
the amount of carbon in the atmosphere is skyrocketing — we're now well over 400 parts per million CO2 in the atmosphere.
... Your transaction would have no effect on
the amount of carbon in the atmosphere.
It is increasingly common to hear climate scientists arguing that this means things should not be left to themselves — that the goal of the 21st century should be not just to stop
the amount of carbon in the atmosphere increasing, but to start actively decreasing it.
We desperately need to reduce our dependence on fossil fuels and decrease
the amount of carbon in the atmosphere.
In 2016,
the amount of carbon in the atmosphere hit an 800,000 year high, and it's likely that this level will substantially rise in the decades ahead.
And by later, I mean much later; today's emissions will affect
the amount of carbon in the atmosphere decades, and possibly centuries, into the future.