1. UK approach to HWP (and some personal reflections)
Jim Penman
Lillehammer meeting
Aug 2004

2. Basics Established time series in inventory
Production method – doesn’t mean we advocate this approach in future
Assume decay constant = rotation period
Accumulation typically 0.2 to 0.4 MtC/yr over period since 1990; possible small source at present, projected accumulation 0.7 MtC/yr in 2010; not Kyoto accounted

3. Discussion
More detailed assumed time constants give rather greater accumulation rate
Landfills significant
Stock change method gives about an order of magnitude more accumulation, since UK imports much of its timber – still small compared with emissions

4. Personal reflections Rights and responsibilities go with the carbon
Sustainably produced biomass isn’t fossil fuel
Unsustainable biomass isn’t renewable energy
Sustainability potential needs recognition
HWP works as a biomass pool in the stock change approach
IPCC approach best compromise currently
GPG puts IPCC in good position to support any outcome, or multiple outcomes in 2006 Guidelines