Um. I'm really not sure what the point of this post is, but I'd recommend looking a little more into the chemistry and energetics of what you're saying. In particular, synthesis of methane is hardly practical. Methane is very abundant, the problem is transporting it. Generating it from other fuels would have generally lower energy yields. One of the biggest pushes in "clean" hydrocarbon energy is the functionalization of methane to methanol, which, being a liquid, is much easier to transport. If you want some real reading on the subject, I can dig through some references to find papers published through ACS, although they're not written for the layperson.