The three main principles of sustainable tourism are environmental responsibility, social equity, and economic viability. Environmental responsibility means minimizing the negative environmental impact of tourism, while maximizing the positive impacts. This includes reducing waste, conserving resources, and promoting sustainable transportation. Social equity means ensuring that the benefits and burdens of tourism are shared fairly among all stakeholders. This includes minimizing the negative impacts of tourism on local communities and cultures, and maximizing the positive impacts. Economic viability means creating a sustainable tourism industry that generates long-term economic benefits for local communities, businesses, and governments. This includes developing responsible tourism policies and practices, and marketing sustainable tourism products and services.