The environmental crisis has become an increasingly alarming global issue, encompassing ecosystem degradation, air and water pollution, climate change, and the loss of biodiversity, and Islamic law holds significant potential as an ethical and legal foundation for addressing this ecological crisis while promoting the development of a green economy. This study examines how environmental fiqh, as a branch of Islamic jurisprudence that governs the relationship between humans and nature, can offer solutions to modern ecological problems through a sustainable economic approach. Using a qualitative method with a descriptive-analytical approach, the research analyzes Islamic legal sources such as the Qur'an, Hadith, and the perspectives of classical and contemporary scholars. The findings reveal that Islam positions humans as khalifah (stewards) on earth with the responsibility to maintain ecological balance, making concepts such as tawazun (balance), islah (reform), and the prohibition of fasad (destruction) highly relevant for fostering ecological awareness and encouraging environmentally friendly economic practices. Environmental fiqh thus emerges as a form of contemporary ijtihad to respond to modern challenges such as industrial waste, natural resource exploitation, and the climate crisis, and its application within the framework of a green economy can serve as a strategic instrument for sustainable development, particularly in Muslim-majority countries, while the integration of Islamic values into public policy, education, and green economic practices represents an essential step toward achieving an equitable and sustainable ecological civilization.