The document discusses various policies that governments can implement to protect the environment, including taxes, subsidies, laws, and regulations. It provides definitions for each: environmental taxes increase the cost of polluting goods, subsidies make green goods cheaper, laws ban harmful products, and regulations impose rules to reduce pollution. The document aims to help students understand these policy options and how governments use them to encourage sustainable growth while protecting the environment. It provides examples of these policies in practice and discusses their potential impacts and effectiveness.