Detailed Explanation:

Answer: Option 1 — It is an international accounting tool for government and business leaders to understand, quantify and manage greenhouse gas emissions

The Greenhouse Gas Protocol is the most widely used global framework for measuring and managing greenhouse gas emissions. Developed by the World Resources Institute (WRI) and the World Business Council for Sustainable Development (WBCSD), it provides standardized methods for organizations and governments to account for their carbon footprint. It is not a UN financial initiative, not a legally binding intergovernmental agreement, and not related to REDD+ initiatives hosted by the World Bank.