Henry David Thoreau's writings, particularly his book Walden, emphasized the importance of preserving wilderness and living in harmony with nature.

Rachel Carson's book Silent Spring documented the harmful effects of pesticides on wildlife and human health, sparking a global movement to ban DDT and other toxic chemicals.

Earth Day was first celebrated on April 22, 1970, and has since become an annual event to raise awareness about environmental issues and promote sustainability.

The Kyoto Protocol was an international agreement that set binding targets for industrialized countries to reduce their greenhouse gas emissions.

Al Gore, a former US Vice President, has been a prominent advocate for climate change action and has played a key role in raising public awareness about the issue.

Extinction refers to the disappearance of a species from the Earth, often as a result of human activities such as habitat destruction, pollution, and climate change.

Green Politics is a political ideology that emphasizes the importance of environmental protection and sustainability, and advocates for policies that promote these goals.

Restoration Ecology is the science and practice of restoring degraded ecosystems to their natural state, often involving the reintroduction of native species and the removal of invasive species.

The Montreal Protocol is an international agreement that aims to protect the ozone layer by phasing out the production and consumption of ozone-depleting substances.

Animal Rights is a movement that advocates for the rights of animals and seeks to end animal cruelty, often through legal and political action.

Environmental Justice is a movement that seeks to address environmental issues at the local and community level, particularly in marginalized communities that are disproportionately affected by environmental pollution and degradation.

Biocentrism is the belief that all living things have intrinsic value and that humans have a moral responsibility to protect the natural world.

Sustainable Development is a movement that seeks to promote sustainable development and balance economic growth with environmental protection, often through policies and practices that minimize environmental impact.

Indigenous Environmentalism is a movement that advocates for the protection of indigenous peoples' rights and the preservation of their traditional lands and cultures, often through legal and political action.

Green Technology is a movement that seeks to address the environmental impacts of technology and promote sustainable technological solutions, often through the development and adoption of renewable energy sources and energy-efficient technologies.