Ecofascism is a pejorative term used by opponents of the environmental movement to accuse environmental activists of fascism; in the UK, it has also been used to refer to far-right efforts to gain influence within the Green Party. Some writers have used it to refer to the hypothetical danger of future dystopian governments, which might resort to extreme or "fascist" policies to deal with environmental issues. Other writers have used it to refer to segments of historical fascist movements that focused on environmental issues.
Environmental historian Michael E. Zimmerman defines "ecofascism" as "a totalitarian government that requires individuals to sacrifice their interests to the well-being and glory of the 'land', understood as the splendid web of life, or the organic whole of nature, including peoples and their states". Zimmerman argues that while no ecofascist government has so far existed, "important aspects of it can be found in German National Socialism, one of whose central slogans was "Blood and Soil".
According to environmentalist David Orton, the term is pejorative in nature and has "social ecology roots, against the deep ecology movement and its supporters plus, more generally, the environmental movement. Thus, 'ecofascist' and 'ecofascism', are used not to enlighten but to smear."
Accusations of ecofascism are common but usually strenuously denied. Such accusations have come from both those on the political left who see it as an assault on human rights, as in social ecologist Murray Bookchin's use of the term, and from those on the political right, as in Rush Limbaugh and other conservative and Wise Use Movement commentators. In the latter case, it is sometimes a hyperbolic use of the term that is applied to all environmental activists, including more mainstream groups such as Greenpeace and the Sierra Club.