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Table 9 Sources of uncertainty and associated data.

From: Estimates of carbon stored in harvested wood products from the United States forest service northern region, 1906-2010

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%