In environmental law, the polluter pays principle is enacted to make the party responsible for producing pollution responsible for paying for the damage done to the natural environment. This principle has also been used to put the costs of pollution prevention on the polluter. It is regarded as a regional custom because of the strong support it has received in most Organisation for Economic Co-operation and Development (OECD) and European Union countries, and has a strong scientific basis in economics. It is a fundamental principle in US environmental law. According to the French historian of the environment Jean-Baptiste Fressoz, financial compensation (not named "polluter pays principle" at that time) is already the regulation principle of pollution favoured by industrials in the nineteenth century. He wrote that: "This principle, which is now offered as a new solution, actually accompanied the process of industrialisation, and was intended by the manufacturers themselves." In modern times, the continued adherence to the polluter pays principle is supported scientifically by economics. One condition that must be satisfied in order to maximise Pareto efficiency is the assignment of all costs of a decision, such as the harm resulting from a decision to pollute, to the agent making the decision, effectively removing all externalities. The polluter pays principle underpins environmental policy such as an ecotax, which, if enacted by government, deters and essentially reduces greenhouse gas emissions. This principle is based on the fact that as much as pollution is unavoidable, the person or industry that is responsible for the pollution must pay some money for the rehabilitation of the polluted environment. The state of New South Wales in Australia has included the polluter pay principle with the other principles of ecologically sustainable development in the objectives of the Environment Protection Authority. The Canadian Energy Regulator mandates that oil companies must pay for any environmental impacts from a spill.
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