This report investigates the impact of green tourism on tourist decision-making, using Thomas Cook, a British travel company, as a case study. The study explores the rationale behind the growing importance of green tourism, driven by environmental concerns like global warming and the depletion of natural resources, which are increasingly influencing tourist choices. The research aims to analyze the significance of green tourism for Thomas Cook, evaluate its relationship with tourist booking decisions, identify its advantages, and suggest alternative strategies for influencing tourist choices. The literature review explores the concept of green tourism, its impact on tourist preferences, and the role of Thomas Cook in promoting sustainable practices. It also examines both the positive and negative effects of green tourism on tourist decision-making, considering factors like environmental awareness, cost, and the availability of eco-friendly options. The report concludes by highlighting the advantages of green tourism for Thomas Cook and the broader implications for the travel industry.