This paper employs a qualitative research methodology, synthesizing data from academic literature, governmental reports, and publications by international organizations to analyze the multifaceted environmental challenges hindering Nigeria's pursuit of sustainable development. Key findings reveal a crisis state across multiple domains: one of the world's highest deforestation rates, pervasive air and water pollution far exceeding safe limits, chronic oil spillage in the Niger Delta, and systemic failures in waste management. The nation's high vulnerability to climate change, manifesting as desertification in the north and coastal erosion in the south, exacerbates these pressures. While Nigeria has developed an extensive body of environmental laws and policies, including ambitious Nationally Determined Contributions (NDCs), their effectiveness is critically undermined by a persistent implementation gap, weak institutional capacity, regulatory fragmentation, and pervasive corruption. This study accomplishes that achieving sustainable development requires a paradigm shift from policy formulation to rigorous implementation of policy and enforcement with instruments to enable, aside from pronouncing sanctions but go ahead to implement penalties. Key imperatives include strengthening governance frameworks, fostering judicial activism for environmental rights, closing the climate finance gap, promoting a circular economy, and empowering local communities as active partners in environmental stewardship: a bottom-up approach as well as vertical collaboration amongst various levels of government and other stakeholders. Without addressing these systemic governance failures, Nigeria's environmental crises will continue to threaten public health, economic stability, and the attainment of the Sustainable Development Goals (SDGs).