The Universal Declaration of Animal Rights, adopted in 1978 by the World League for the Protection of Animals, sets out a comprehensive framework of principles for the protection of animals, including their right to life, liberty, and freedom from suffering.

The Endangered Species Act (ESA) is a landmark piece of legislation in the United States that aims to protect and recover species that are at risk of extinction. It provides a framework for identifying, listing, and protecting endangered and threatened species, as well as their critical habitats.

The legal principle of 'standing' in environmental law requires that a person or group must have a personal stake, or 'injury-in-fact', in an environmental issue in order to bring a lawsuit. This means that they must have suffered or be at risk of suffering a concrete and particularized harm as a result of the alleged environmental violation.

The Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) is an international agreement that aims to regulate the trade of endangered species and their parts. It establishes a system of permits and controls for the import, export, and re-export of listed species, with the goal of preventing their over-exploitation and ensuring their survival.

The Animal Welfare Act (AWA) is a federal law in the United States that regulates the sale, transportation, and handling of animals, including those used in research, exhibition, and transport. It sets minimum standards for the humane treatment of animals and requires that they be provided with adequate food, water, shelter, and veterinary care.

The public trust doctrine is a legal principle that recognizes the public's right to certain natural resources, such as air, water, and wildlife, and imposes a duty on the government to protect and preserve these resources for the benefit of present and future generations.

The Marine Mammal Protection Act (MMPA) is a federal law in the United States that aims to protect marine mammals from hunting, harassment, and other human-caused threats. It prohibits the taking, importing, and exporting of marine mammals and their parts, with certain exceptions for scientific research and subsistence hunting.

The Ramsar Convention on Wetlands, also known as the Convention on Wetlands of International Importance, is an international treaty that aims to promote the conservation and sustainable use of wetlands. It provides a framework for international cooperation and action to protect wetlands and their resources, and to promote their wise use.

The precautionary approach is a legal principle that aims to protect the environment from potential harm, even when there is scientific uncertainty about the extent of the risk. It requires decision-makers to take precautionary measures to prevent or minimize the risk of environmental harm, even if the full extent of the risk is not yet known.

The United Nations Framework Convention on Climate Change (UNFCCC) is an international environmental treaty that aims to stabilize greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous human interference with the climate system. It provides a framework for international cooperation to address climate change and its impacts.

The Lacey Act is a federal law in the United States that regulates the trade of wildlife and plants, including those that are endangered or threatened. It prohibits the import, export, and interstate transport of illegally taken or traded wildlife and plants, and it also requires the labeling of certain wildlife products.

The Convention on Migratory Species (CMS), also known as the Bonn Convention, is an international treaty that aims to protect migratory species and their habitats. It provides a framework for international cooperation to conserve migratory species and their habitats, and to address threats to their survival.

The principle of intergenerational equity is a legal principle that recognizes the responsibility of the present generation to protect the environment for the benefit of future generations. It requires decision-makers to consider the long-term consequences of their actions and to take steps to ensure that the environment is not degraded or depleted in a way that would harm future generations.

The Convention on Biological Diversity (CBD) is an international treaty that aims to promote sustainable development and protect the environment. It provides a framework for international cooperation to conserve biodiversity, ensure the sustainable use of biological resources, and promote fair and equitable sharing of the benefits arising from the use of genetic resources.

The polluter pays principle is a legal principle that holds that the polluter should bear the cost of cleaning up pollution that they have caused. It is based on the idea that the polluter is responsible for the harm that they have caused to the environment and that they should be held accountable for the costs of repairing that harm.