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Harvested Wood Products in the U.S. National Greenhouse Gas Inventory: Methodology and Accounting

Harvested Wood Products in the U.S. National Greenhouse Gas Inventory: Methodology and Accounting. Harvested Wood Products: Topics. Overview of U.S. Emissions and Removals U.S. Estimation Method and Results for Harvested Wood Products Accounting Approach.

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Harvested Wood Products in the U.S. National Greenhouse Gas Inventory: Methodology and Accounting

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  1. Harvested Wood Products in the U.S. National Greenhouse Gas Inventory: Methodology and Accounting

  2. Harvested Wood Products: Topics • Overview of U.S. Emissions and Removals • U.S. Estimation Method and Results for Harvested Wood Products • Accounting Approach

  3. Overview of U.S. Greenhouse Gas Emissions, 2002 Emissions = 6,935 Tg CO2 eq. Removals = 691 Tg CO2 eq. HWP = 215 Tg CO2 eq.

  4. U.S. Estimation Method Method details for the U.S.– • Track Inputs to, and outputs from carbon pools • Begin in 1910, track to current time • Product carbon pools • Products in use • Products in dumps or solid waste disposal sites • Use forest sector model framework – the WOODCARB model • to track all products from annual harvest • to track imports/ exports

  5. U.S. estimation example – tracking carbon in single family houses

  6. Harvested Wood Products: Methodology Disposition of Carbon in Harvested Wood - U.S. Average Removals Emissions Source: Heath and others, 1996; Skog and Nicholson, 1998

  7. U.S. data Annual Data Requirements • Harvest statistics • Product production • Product exports and imports Coefficients • Factors to convert product units to carbon • Distribution of products to end uses • Use life of products in end uses • Portion of discarded wood to dumps vs SWDS vs burning • Portion of wood in permanent vs temporary storage in SWDS • Decay rates in dumps & SWDS The U.S. assumes the coefficients are the same for products used domestically and products exported

  8. U.S. Product Lifetime

  9. Harvested Wood Products: Comparison of Approaches U.S. HWP Removals in 2002 = 215 Tg CO2 eq. Variables from U.S. HWP Estimation Methods Approaches: Production (A+B) = 215 Stock Change (A+C) = 248 Atmospheric Flow (A + C – (D – E)) = 227

  10. Harvested Wood Products: Timeline • September 2004, UNFCCC HWP workshop • November 2004, IPCC Guidelines (GL) revisions, HWP experts meeting • **December 2004, SBSTA 21** • March 2005, 1st review of IPCC GL revision by experts • September 2004, 2nd review of IPCC GL revision by experts and governments • May 2006, SBSTA 24, IPCC GL revision presented to SBSTA

  11. Conclusions • HWP is an important sink in the U.S. • Tracking HWP will highlight opportunities to better manage HWP pools • Transparency can be improved if countries report stock changes associated with both imports and exports regardless of approach • Encourage transparent reporting now, such that any approach can be applied in the future • Accounting systems should be consistent with IPCC default • There is a narrow window of opportunity to provide guidance to IPCC authors on HWP

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