Climate change poses significant threats to global cultural heritage, with rising temperatures, increased precipitation, and more frequent extreme weather events accelerating the decay of historic sites and natural landscapes. This paper examines the multifaceted impacts of climate change on cultural heritage, highlighting the urgent need for effective mitigation strategies as outlined in the 2015 Paris Agreement. Through case studies of Hurst Castle in England and Venice in Italy, the study illustrates how these changes have already led to significant damage to heritage sites. It underscores the role of international cooperation and the integration of climate action into heritage preservation efforts. Furthermore, the paper discusses the importance of sustainable development and cultural heritage protection, calling for global action to ensure the preservation of human history in the face of climate change. The findings stress the need for comprehensive climate risk assessments and strategic planning to safeguard cultural heritage for future generations.