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The research employs a lobby group model and cross-country data from 104 countries to analyze the drivers of environmental policy stringency. The authors find that a higher number of environmental lobby groups generally leads to stricter policies. Crucially, the study identifies an interaction effect where political competition increases policy stringency primarily in countries with high levels of democratic participation, whereas participation alone has no effect in pure dictatorships. The results suggest that supporting local environmental NGOs in developing countries may be an effective channel for international donors to improve global environmental quality.