06:27 Jul 25, 2010 

Thank you all!

09:03 Jul 22, 2010 

@BAIYU Good thinking! It makes sense now. Thank you!

08:52 Jul 22, 2010 

Yes, you are partly right. I just find out the source pdf, which indicate "Unlike fossil fuels, burning biomass
is part of the natural carbon cycle.
When biomass is used as a fuel, carbon
stored in renewable organic material
is released into the atmosphere. It is
captured back into the natural carbon
cycle as the biomass regrows. As a
result, using biomass as a fuel helps
maintain a constant level of carbon in the
environment and plays an important role
in balancing Earth’s natural carbon cycle"

So, "used as raw material for industrial processes" should be linked to "biomass", which means using of biomass in producing carbon dioxide. And biomass can be seen as a raw material for producing carbon dioxide.

Thanks a lot.

08:32 Jul 22, 2010 

Biomass: natural materials from living or recently dead plants, trees and animals, used as fuel and in industrial production, especially in the generation of electricity (OALD)

If it is used as fuel, it can't be used as raw material, can it?