[eno_]

Actually, the experiement was not performed to show you could "recycle" CO2. The experiment was performed to show hydrocarbom formation might not require living plant and animal matter as an input. Hence "fossil fuel" might be a misnomer. "Mineral fuel" might be more accurate.

[11B3]

Exactly! That is why the oil companies keep continually finding these huge untapped reserves of oil. The earth manufactures the oil completely independent of any prior boimass existing on Earth. Of course, there are also a number of planets/moons within the solar system that have significant amounts of methane in their atmospheres. How many dinosaurs existed on those worlds to make that gas???? The traditional and misleading explanation for oil can't have it both ways - and it shows that they've been lying all along.