Reducing greenhouse gases and ensuring energy security are important solutions to the climate change adaptation process. It requires efforts from all countries around the world in many ways, including developing waste-to-energy. In particular, according to the recent COP 26 Conference (November 2021), harnessing the potential of waste-to-energy, following the trend of phasing out coal power to address climate change, needs specialized attention. This article breaks down some of the needs for waste-to-energy growth and the legal provisions of waste-to-energy development assistance for the purposes of reducing greenhouse gases, ensuring energy security, and improving the effectiveness of the climate change response.