Harvested wood products in the u s national greenhouse gas inventory methodology and accounting
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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 topics
Harvested Wood Products: Topics Inventory:

  • Overview of U.S. Emissions and Removals

  • U.S. Estimation Method and Results for Harvested Wood Products

  • Accounting Approach

Overview of u s greenhouse gas emissions 2002
Overview of U.S. Greenhouse Gas Emissions, 2002 Inventory:

Emissions = 6,935 Tg CO2 eq.

Removals = 691 Tg CO2 eq.

HWP = 215 Tg CO2 eq.

U s estimation method
U.S. Estimation Method Inventory:

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

U s estimation example tracking carbon in single family houses
U.S. estimation example – Inventory: tracking carbon in single family houses

Harvested wood products methodology
Harvested Wood Products: Methodology Inventory:

Disposition of Carbon in Harvested Wood - U.S. Average



Source: Heath and others, 1996; Skog and Nicholson, 1998

U s data
U.S. data Inventory:

Annual Data Requirements

  • Harvest statistics

  • Product production

  • Product exports and imports


  • 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

Harvested wood products comparison of approaches
Harvested Wood Products: Comparison of Approaches Inventory:

U.S. HWP Removals in 2002 = 215 Tg CO2 eq.

Variables from U.S. HWP Estimation Methods


Production (A+B) = 215

Stock Change (A+C) = 248

Atmospheric Flow (A + C – (D – E)) = 227

Harvested wood products timeline
Harvested Wood Products: Timeline Inventory:

  • 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

Conclusions Inventory:

  • 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