Biocentrism is a theory of environmentalism that emphasizes the inherent value of all living things, regardless of their usefulness to humans.

Sustainability is a theory of environmentalism that emphasizes the importance of preserving the natural environment for future generations by using resources in a responsible and sustainable manner.

Degrowth is a theory of environmentalism that emphasizes the importance of reducing human impact on the natural environment by reducing consumption and production.

Restorationism is a theory of environmentalism that emphasizes the importance of restoring the natural environment to its original state, typically through active intervention.

Preservationism is a theory of environmentalism that emphasizes the importance of protecting the natural environment from human activities, typically through the establishment of protected areas.

Technocentrism is a theory of environmentalism that emphasizes the importance of using technology to solve environmental problems, typically through the development of new technologies.

Behaviorism is a theory of environmentalism that emphasizes the importance of changing human behavior to reduce environmental impact, typically through the use of positive and negative reinforcement.

Environmental economics is a theory of environmentalism that emphasizes the importance of economic growth to solve environmental problems, typically through the use of market-based mechanisms.

Environmental politics is a theory of environmentalism that emphasizes the importance of political action to solve environmental problems, typically through the use of legislation and regulation.

Environmental justice is a theory of environmentalism that emphasizes the importance of social justice to solve environmental problems, typically through the use of community-based activism.

Ecotheology is a theory of environmentalism that emphasizes the importance of spiritual and religious beliefs to solve environmental problems, typically through the use of religious teachings and practices.

Traditional ecological knowledge is a theory of environmentalism that emphasizes the importance of indigenous knowledge and practices to solve environmental problems, typically through the use of traditional methods of resource management.

Ecofeminism is a theory of environmentalism that emphasizes the importance of feminism to solve environmental problems, typically through the use of feminist analysis and activism.

Deep ecology is a theory of environmentalism that emphasizes the importance of deep ecology to solve environmental problems, typically through the use of spiritual and philosophical insights.

Radical environmentalism is a theory of environmentalism that emphasizes the importance of radical environmentalism to solve environmental problems, typically through the use of direct action and civil disobedience.