They referred me to Wikipedia which contains this graph and I quote one email exactly
PS. The business of where CO2 goes is a separate thing, the next logical step. The only conclusion of this post is that most CO2 goes into the ocean within 50 years or less, mostly never to return in our lifetimes. The Bern cycle, burning trees, Henry's law, CO2 measurements, bushfires, algae and so much are about what happens next, but you need none of them. The conclusion is inescapable.
PPS. Hans Suess, an Austrian scientist and one of the founders of UCSD noted the dilution of C14O2 by industrial gases after 1890. The effect was under 2%, although people now try to dispute this. As the fossil fuel CO2 has no C14 the effect would be much larger if the fossil fuel gas stayed in the atmosphere. The unavoidable conclusion was that it didn't. Even now the ultimate level is still the historic level, which confirms all new gas vanishes. The contention that 33% of the gas is fossil fuel gas is wrong or concentrations of C14O2 would head to 2/3 of the historic levels.