However, there is a (probably complex) heat-cycling issue, too. If you
let
corn stover compost, it gives off heat. If you burn it, it gives off
heat.
If you convert it to ethanol and burn the ethanol, it gives off heat.

Quick now, calculus students...

--
Ed Huntress

Please don't quote me on this, cause I'm not sure I'm accurate.

I think any heat that is given off from plant life is actually stored solar
energy. It's possible it may balance out.