What are greenhouse gas inventories and why are they important for policy?

• A. A budget of carbon credits for trading programs.
• B. An informal list of climate action measures.
• C. Systematic accounting of emissions and removals by gas and sector; essential for tracking progress, reporting, and policy updates.
• D. A schedule of climate conferences.

Answer: (C)

Greenhouse gas inventories are a systematic accounting of emissions and removals by gas and sector. They provide a transparent, comparable picture of where emissions come from and how much is being removed by sinks, typically covering sectors like energy, transport, buildings, industry, agriculture, and land use. This detailed balance is crucial for policy because it shows progress toward targets over time, supports reporting to international agreements, and guides decisions about where to reduce emissions and how to allocate resources. Using consistent methods and international guidelines makes data credible and comparable across countries and years, helping identify the biggest reduction opportunities, model policy impacts, and adapt strategies as new information or technologies appear. They also support communicating results to the public and stakeholders and help ensure accountability and ongoing policy updates. This is not a budget for carbon trading, nor a casual list of measures, nor a schedule of conferences.