In response to growing concerns about environmental degradation linked to economic and human development, this study examines the impact of environmental fiscal policies, green technologies, and R&D expenditures on environmental sustainability in the G7 countries. Using advanced econometric techniques such as the Cross-Sectionally Augmented Autoregressive Distributed Lag (CS-ARDL) model and the Dynamic Common Correlated Effects (DCCE) approach, the research captures both short- and long-term relationships between these variables and their impact on greenhouse gas (GHG) emissions. The results support the inverted U-shaped environmental Kuznets curve, suggesting that environmental impacts initially increase with economic growth, but decline after a threshold is reached. The study shows that environmental taxes, when well designed, play a critical role in reducing GHG emissions, along with targeted R&D investment and the adoption of green technologies. These findings underscore the importance of effective tax policies that adhere to the polluter-pays principle and include incentives such as tax credits to encourage green innovation. The study provides valuable insights for policymakers, highlighting the need for tailored fiscal policies and increased investment in sustainable technologies to align with the Sustainable Development Goals and support long-term environmental resilience in the G7.