Those are biogases in many respects. Those aren't biofuels. We're talking about creating biofuels here, from fresh stock, in many respects, to get there.
The biofuels industry itself understands that it takes 1.6 units of power to create one unit of power to come out the other end. That, of course, is clean, as we define it, versus hydrocarbon energy.
How does that actually square up as being energy efficient at the end of the day and not creating more actual greenhouse gas as you say the 30 studies you've read have shown?