In 2023, Japan's greenhouse gases emissions stood at 1.151 billion metric tons CO2 equivalent. The forecast from 2024 to 2028 shows a consistent decline, reaching 1.1086 billion metric tons in 2028. Year-on-year, emissions are anticipated to decrease by approximately 0.75% annually. Over the five-year forecast period, the compound annual growth rate (CAGR) reflects an average annual decrease of around 0.73%, suggesting a steady effort toward reducing national greenhouse gas emissions.

Future trends to watch for:

Japan's implementation and impact of policy measures aimed at further reducing carbon emissions.
Technological advancements in renewable energy and their adoption rate, influencing emission reduction.
Potential economic shifts affecting industrial output and corresponding emission levels.
International agreements and collaborations aiming at global emission reduction targets.