Increased greenhouse gas (GHG) emissions have triggered a global climatic shift that threatens all species. The last century witnessed many improvements in several industries that elevated GHG emissions to levels not seen in several years. Energy usage is a major source of GHG emissions. The current study will examine how green finance and economic fitness (globally competitive and diversified production) synergistically affect GHG emissions and renewable energy growth. GMM, FMOLS, and quantile regression were used to analyze the OECD economies. Green financing and economic fitness reduced GHG emissions and increased renewable energy use in all three models. The synergistic effect of green financing (GF) and economic fitness (EFI) shows that nations can significantly mitigate the emission of greenhouse gases (GHGs) and encourage the adoption of renewable energy sources. Green financing and economic fitness (EFI) seem to work better in high-carbon economies than in low-carbon ones. GF has a greater impact on greenhouse gas (GHG) emissions in countries with higher emissions. In both high- and low-emission countries, good governance, regulatory frameworks, economic risk, and developed human capital help reduce greenhouse gas emissions. However, GDP affects GHG emissions positively in all OECD countries. Moreover, GDP, effective government, quality regulations, economic risk, and human capital promote renewable energy use in economies. Private enterprises and households need financial incentives to adopt renewable energy technology quickly. Businesses may finance environmental projects without government assistance. Complex and varied product manufacturers are encouraged to employ renewable energy and minimize greenhouse gas emissions to increase economic resilience.