In this paper, we demonstrate that when environmentalist niche parties compete in a given constituency over a number of elections, but continually fail to win seats, then environmental sabotage becomes more frequent in that constituency. When mainstream tactics fail, radical tactics are used more frequently. Using a new data-set on the success rates of all Green Party candidates in US states, we show that environmental sabotage occurs more often when Green Party candidates fail to win even

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... offices. This is true even when we control for other political expressions of environmentalism, such as interest group activity, and when we define 'success' through votes not seats. We discuss the implications of this for environmental politics, for social movements and democracy, and for political violence in the US.