This lecture discusses the causes of biodiversity decline at local, regional, national, and international levels, including habitat loss, overexploitation, and pollution. It explores the impact of landscape transformations on wildlife-friendly farmland and the importance of protected areas. The lecture also covers the effects of climate change on butterfly distribution and phenological shifts. Furthermore, it addresses the risks posed by habitat destruction, invasive species, and hybridization. The instructor emphasizes the significance of red lists in assessing extinction risks and highlights the need for conservation efforts in threatened natural environments.