Data Guy: As someone who has already worked out the true market size and how it divides up to
a reasonably high level of accuracy using publicly available data, I'm not sure you're asking the right question here.
The method was quite widely used, is
reasonably reliable (
accuracy about + / -3 % as I recall) and shows significant fluctuation in pre-1950's
levels of CO2, including much
higher asa well as lower values.