BBC NEWS | Science/Nature | Tall grasses set to power Europe: "Burning biomass is broadly neutral in terms of its emissions of carbon dioxide, the major gas thought responsible for warming the planet.
'As the plant grows it is drawing carbon dioxide out of the air,' explained Professor Steve Long, from the University of Illinois. 'When you burn it, you put that carbon dioxide back, so the net effect on atmospheric CO2 is zero.
'Whereas, if you take coal out of the ground and burn it, you are adding a net gain of carbon to the atmosphere.'"
"t could actually make a major contribution and it doesn't require big technological breakthroughs to do that."