United Nations Environment Programme (UNEP).
The United Nations Environment Programme is the main UN agency for environmental issues. Its activities are related to areas including climate change, ecosystem management, environmental governance, and resource efficiency; amongst other topics. UNEP has been credited with a number of significant successes in international environmental diplomacy and policy, such as the 1987 Montreal Protocol on substances that deplete the ozone layer. Additionally, UNEP offers informative reports and policy advice to governments on currently relevant environmental issues like air pollution and waterway contamination, which typically affect multiple countries simultaneously.