a. It is an international accounting tool for government and business leaders to understand, quantify and manage greenhouse gas emissions

b. It is an initiative of the United Nations to offer financial incentives to developing countries to reduce greenhouse gas emissions and to adopt eco-friendly technologies

c. It is an inter-governmental agreement ratified by all the member countries of the United Nations to reduce greenhouse gas emissions to specified levels by the year 2022

d. It is one of the multilateral REDD+ initiatives hosted by the World Bank