Ringo, I don't understand how you claim this will reduce emissions. All we're doing is substituting one source of energy for another. It all ends up as greenhouse gases when you burn it. Methane is easy to transport, most houses in the USA have piped-in LP gas, it could just as easily be methane. Sure methane is expensive, unless you make it from sewage and then it's basically free. It isn't so efficient for cars, but there are plenty of methane-fueled car designs that work well enough. The 1960s Whole Earth Catalogs had huge chapters on the subject of Methane fuel, cars, home heating, electric power generation, etc. And that was just from a bunch of lotech hippie communes running the stuff.
I don't get your concept of removing carbon from the ecocycle. Carbon isn't being lost or destroyed, merely converted in form. It's either turkey guts in the landfill rotting and releasing CO2 slowly, or else it's oil in an engine burning and releasing CO2 quickly. Either way it ends up in the ecosystem.