The Paris Agreement, adopted in 2015, is a legally binding international treaty on climate change. It aims to limit global warming to well below 2 degrees Celsius, preferably to 1.5 degrees Celsius, compared to pre-industrial levels.

The Clean Air Act, enacted in 1970, is a comprehensive federal law in the United States that aims to protect public health and the environment by regulating air emissions from stationary and mobile sources.

Land pollution refers to the contamination of soil, groundwater, and other terrestrial environments with harmful substances, such as heavy metals, pesticides, and industrial waste.

Environmental impact assessments are systematic processes used to identify, predict, and evaluate the potential environmental impacts of proposed projects or activities, and to suggest measures to mitigate these impacts.

The United Nations Environment Programme (UNEP) is the leading global environmental authority that sets the global environmental agenda, promotes the coherent implementation of the environmental dimension of sustainable development within the United Nations system, and serves as an authoritative advocate for the global environment.

The 'polluter pays' principle holds that the polluter should bear the costs of pollution and its cleanup, rather than passing these costs on to the public or the environment.

Economic instruments, such as pollution taxes, emissions trading systems, and subsidies for clean technologies, are market-based mechanisms that aim to reduce pollution by creating financial incentives for polluters to reduce their emissions.

Environmental standards are legally enforceable limits on the amount of pollution that can be released into the environment, typically expressed as concentrations of pollutants in air, water, or soil.

The Montreal Protocol, adopted in 1987, is an international treaty that aims to protect the ozone layer by phasing out the production and consumption of ozone-depleting substances, such as chlorofluorocarbons (CFCs) and hydrochlorofluorocarbons (HCFCs).

Environmental monitoring involves the systematic collection and analysis of data on the state of the environment, including air quality, water quality, soil quality, and biodiversity, to assess environmental conditions and trends.

Voluntary agreements are negotiated agreements between government and industry, or other stakeholders, to reduce pollution or improve environmental performance beyond what is required by law.

Environmental impact statements (EISs) are detailed reports that assess the potential environmental impacts of proposed projects, including the direct, indirect, and cumulative effects, and suggest measures to mitigate these impacts.

The Stockholm Convention, adopted in 2001, is an international treaty that aims to reduce the production and consumption of persistent organic pollutants (POPs), which are toxic chemicals that can accumulate in the environment and pose risks to human health and the environment.

Sustainable development is a concept that seeks to balance economic growth with environmental protection and social equity, aiming to meet the needs of the present without compromising the ability of future generations to meet their own needs.

The Convention on Long-range Transboundary Air Pollution (CLRTAP) is an international treaty that aims to reduce the transboundary air pollution in Europe. It was signed in 1979 and has been amended several times since then.