The National Environmental Policy Act (NEPA) is a United States law enacted in 1969 that requires federal agencies to assess the environmental impacts of their proposed actions before making decisions. NEPA ensures that environmental factors are weighed alongside economic and technical considerations, promoting transparency and public involvement in the decision-making process. This act plays a crucial role in environmental justice, particularly in the wake of disasters like Hurricane Katrina, as it emphasizes the importance of considering vulnerable communities affected by environmental changes.