The Clean Development Mechanism (CDM) aims to help both rich and poor countries: rich ones cut greenhouse gases while helping poorer countries with sustainable development. It's important for developing nations to join CDM projects not just for reducing emissions but also to boost their economies, societies, and environment. Each country can decide how to measure the impact of these projects on their own development goals. By picking and planning CDM projects carefully, they can benefit their local communities while tackling global climate issues.