lol. this graph doesnt prove anything except that you dont understand it. comparing conditions > ~20 mya is not apples-to-apples since the continents, ocean basins, and atmosphere were composed differently and therefore climatic function and elemental and water cycles operated differentially. for instance, in much of the geologic past, the ocean operated as a net co2 source, rather than a sink. rampant anthropogenic co2 emissions have reversed that, absorbing ~30% of post-industrial era emissions, which we can precisely track in the seawater carbonate system. and we know its anthropogenic fossil carbon since fossil fuels lack radioactive carbon isotopes, having been shielded underground from solar radiation. thus, as we burn it, we are able to measure changes in carbon isotope ratios in the atmosphere, biota, and sediment deposits all over the world. and we know precisely how much fossilized carbon we are putting into the atmosphere thanks to the excellent accounting of the worlds most profitable industry.
Australia