Ecotourism has the potential to contribute financially to conservation efforts through tourism revenue generation and by increasing environmental awareness, but its impacts depend on how it is implemented. A meta-analysis of 188 ecotourism case studies found that 62.8% were considered ecologically sustainable. Factors correlated with sustainability included local community involvement, habitat type (tropical forests and savannahs more suitable), and study methodological rigor. Sustainability was negatively correlated with projects in Africa, Asia, and Central America. For ecotourism to effectively support conservation, local communities must be involved in planning, visitor numbers must be limited, and national legal support is needed.