Table 9 Sources of uncertainty and associated data.
Source of Uncertainty | Specific Factor | Years | Relevant products | 90% CI |
|---|---|---|---|---|
Conversion factors | mbf:ccf | 1906-1979 | Timber products | ± 30% |
|  | mbf:ccf | 1980-2009 | Timber products | ± 15% |
|  | ccf:MgC | 1906-2009 | Primary products | ± 5% |
Reported harvest | Harvest in mbf | 1906-1945 | Timber products | ± 30% |
|  | Harvest in mbf | 1946-1979 | Timber products | ± 20% |
|  | Harvest in mbf or ccf | 1980-2009 | Timber products | ± 15% |
Product distribution | Roundwood to softwood sawtimber | 1906-1979 | Timber products | ± 30% |
|  | Roundwood to softwood sawtimber | 1980-2009 | Timber products | ± 15% |
|  | Softwood sawtimber to lumber | 1906-1949 | Timber products | ± 30% |
|  | Softwood sawtimber to lumber | 1950-1979 | Timber products | ± 20% |
|  | Softwood sawtimber to lumber | 1980-2009 | Timber products | ± 15% |
|  | Lumber going to new housing | 1906-2009 | Primary products | ± 15% |
|  | Panels going to new housing | 1906-2009 | Primary products | ± 15% |
|  | Residues going to pulp | 1906-2009 | Primary products | ± 15% |
Product decay | Product half-life or storage factor | 1906-2009 | All end-use | ± 15% |
|  | Fraction of discards to landfills | 1906-2009 | Discarded | ± 15% |
|  | Landfill decay limits | 1906-2009 | Landfilled | ± 15% |
|  | Landfill half-life | 1906-2009 | Landfilled | ± 15% |