A few days ago, we submitted documentation, in our report of the "Development of an Improved Sabatier Reactor", about a presentation made at the ASME Conference on Environmental Systems, back in 1979, by US Department of Defense contractors United Technologies, that our own government has most likely known now for more than thirty years that Carbon Dioxide can be converted into Methane.
Of course, as we've tediously documented, Europe's Nobel Committee has known that since 1912.
That's when the original "Sabatier Reactor" that converts CO2 to Methane, which our Defense contractors were working, in the 1970's, to improve, became, or should have become, public knowledge.
We have also, from other sources, including Penn State University, documented technologies wherein Carbon Dioxide can be recycled, through it's use as a raw material in the synthesis of even higher, liquid hydrocarbons.