Climate change communication varies significantly across cultures due to differences in political ideology, environmental identity, religious worldviews, economic development, and cultural narratives. While Western climate messaging emphasizes scientific urgency and carbon responsibility, emerging economies often frame climate change as a developmental justice issue, whereas island nations highlight existential vulnerability. Using cross-cultural surveys, case studies from multiple countries, and discourse analysis of public campaigns, this paper identifies distinct narrative frameworks and emotional triggers that influence climate messaging efficacy globally. The study presents a culturally adaptive communication framework to support policymakers, NGOs, and corporations in crafting context-sensitive climate campaigns.