This research paper examines the relationship between ethics and environmental sustainability from a moral and philosophical perspective. It argues that environmental challenges are not merely technical or economic issues but fundamentally ethical concerns involving justice, responsibility, human well-being, and obligations toward future generations. The study reviews major ethical theories including virtue ethics, deontology, utilitarianism, and environmental ethics, and analyzes their relevance to sustainability. The paper concludes that sustainable development requires a strong ethical framework that integrates ecological protection with social responsibility.