Every year, thousands of companies disclose data about their environmental impacts, risks and opportunities to CDP for independent assessment against its scoring methodology. In 2018, companies were requested to do so by over 650 investors with over US$87 trillion in assets, and/or 115 major purchasing organizations with US$3.3 trillion in purchasing power. Companies receive scores of A to D- for how effectively they are tackling climate change, deforestation and water security. Those that don't disclose or provide insufficient information are marked with an F.