An environmental issue is the negative aspects of human activity on the biophysical environment. Environmentalism, a social and environmental movement that started in the 1960s, focuses on addressing environmental issues through advocacy, education and activism.

The biophysical environment is the symbiosis between the physical environment and the biological life forms within the environment, and includes all variables that comprise the Earth’s biosphere. The biophysical environment can be divided into two categories: the natural environment and the built environment, with some overlap between the two. Following the industrial revolution, the built environment has become an increasingly significant part of the Earth’s environment.

Environmentalism is a broad philosophy and social movement regarding concerns for environmental conservation and improvement of the state of the environment. Environmentalism and environmental concerns are often represented with the color green. An informal or derogatory label for environmentalists is the term “greenie” or “tree-hugger”.

The environmental movement, a term that includes the conservation and green movements, is a diverse scientific, social, and political movement for addressing environmental issues.

Environmentalists advocate the sustainable management of resources and stewardship of the environment through changes in public policy and individual behavior. In its recognition of humanity as a participant in (not enemy of) ecosystems, the movement is centered on ecology, health, and human rights.

The environmental movement is represented by a range of organizations, from the large to grassroots. Due to its large membership, varying and strong beliefs, and occasionally speculative nature, the environmental movement is not always united in its goals. At its broadest, the movement includes private citizens, professionals, religious devotees, politicians, and extremists.

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