We live during a crucial period of human history on Earth. Anthropogenic environmental changes are occurring on global scales at unprecedented rates. Despite a long history of environmental intervention, never before has the collective impact of human behaviors threatened all of the major bio-systems on the planet. Decisions we make today will have significant consequences for the basic conditions of all life into the indefinite future. What should we do? How should we behave? In what ways ought we organize and respond? The future of the world as we know it depends on our actions today.
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