Shipping industry accounts for over 1'000 million tonnes of CO2 each year and renewable energy propulsion doesn't even exist in concept for very large ships. There is however one zero-emission technology that has been long proven on sea... https://www.spglobal.com/platts/en/market-insights/latest-news/shipping/110420-shipping-industry-should-consider-nuclear-option-for-decarbonizing-experts