Reducing consumption of fossil fuels can help decrease the amount of carbon dioxide being released into the atmosphere. Carbon dioxide is absorbed by the oceans, leading to ocean acidification which can harm marine life such as corals and shellfish. Additionally, reduced fossil fuel consumption can lower the amount of pollutants like mercury and sulfur entering the oceans through air and water runoff. By lessening the impact of these harmful substances, we can help maintain a healthier ocean ecosystem for marine organisms to thrive in.