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The carbon stock function of harvested wood products (HWPs) is attracting attention among climate change countermeasures. Among HWPs, particle board (PB) and fiberboard (FB) mainly use recycled materials. This study estimated carbon stocks of PB and FB and their annual changes over the past 70 years in Japan using three methods of the Intergovernmental Panel on Climate Change guidelines: Tiers 1–3. Tier 1 uses first order decay (FOD), a 25-year half-life, and the Food and Agriculture Organization of the United Nations database. Tier 2 uses FOD, a 25-year half-life, and Japan-specific statistics. Tier 3 uses a log-normal distribution for the decay function and a 38–63-year half-life of building PB/FB. Japan's PB and FB carbon stocks have increased for the past 70 years. The latest carbon stock in early 2022 and the annual change in carbon stock in 2021 was 21.83 million t-C and 0.42 million t-C/year, respectively for Tier 3. Tier 3 has the highest estimation accuracy by using decay functions and half-lives that match the actual conditions of building PB and FB, whereas Tiers 1 and 2 were underestimates. Approximately 40% of the carbon stock is derived from waste wood, which extends its utilization. [ABSTRACT FROM AUTHOR]

This paper investigates the impacts of the Target-Setting Emissions Trading (TSET) Program launched by Saitama Prefecture in Japan in 2011 on the adoption of low-carbon technology. Using facility-level data on the manufacturing sector, the causal relationship between implementation of the program and investment in high-efficiency equipment is estimated. The results show that the TSET Program promoted the adoption of high-efficiency machines and devices for the first three years of the second compliance period, whereas the program did not spur investments in high-efficiency equipment during the first compliance period. These results suggest that the manufacturing facilities may have adopted relatively cheaper emissions reduction plans in the first compliance period such as improvements to equipment they already owned, whereas in the second compliance period, when the emissions targets became stricter, they allocated money and resources to introduce high-efficiency equipment. These findings indicate that the TSET Program succeeded in encouraging emissions reduction efforts by facilities in the manufacturing sector covered by the scheme, even though the program lacks penalties for noncompliance. [ABSTRACT FROM AUTHOR]