Methane doesn't release CO2 unless it is burned, the methane itself in it's natural state is however worse for the environment if it is released to float around than the CO2 it becomes when it is burned.
They are both greenhouse gasses. The point is we have to avoid excesses of greenhouse gasses not eliminate them altogether. For that reason, animal and plant based CO2 or methane is 100 times better than fossil based CO2. Especially since the next plant crop will suck up the CO2 that the previous lot released when it's product was burned.
True, I wasn't disagreeing with your idea, I was just saying that you'd got the wording wrong, you seemed to be saying that CH4 (methane) somehow is CO2... The idea is a good one, it's something I'd push for if I I were in government, unfortunately, I'm not.
I just love the idea of palm oil plantations sucking up CO2, being used to make both biodiesel AND methane(CH4) that release non-fossil CO2 that is then sucked up by next years crop. Plus the arabs going insane at the lost oil sales!
Here's another idea:
Piggeries producing pork, leather and pig poop (another rich source of methane) and other pig products to put in munitions and public transit systems to deter muSSlim terrorists. The pigs will also be fed on by-products like cotton trash as well as other grains that also suck up CO2 when grown.
Add wind power from our huge coastlines, Solar from our deserts, geo-thermal, bio-mass etc and from a technological POV we are definitely on the brink of energy independence AND cleaner energy. It just takes leadership.