He's hacking on you, because what you posit is outrageous. Here4 meant futures with an expiry for the year 10,002,020 A.D. Meaning that it seems kinda' ridiculous to price out fossil fuels based on volcanic ash accelerating "fossil activity". It's not really the result of volcanic ash, but just the general decomposition of organic matter mixed with mud and slowly sinking into the earth's crust over gazillions of years, facing increasing heat and pressure, and the resultant "fuels" forming through this process.