The document discusses green fuels as future renewable energy sources. It introduces various green fuels such as biofuels from algae and plastic waste. Algae biofuel has advantages such as being renewable, carbon-fixing, and solving power needs and waste disposal issues. Plastic waste can also be converted into fuel through processes like pyrolysis or thermal depolymerization. In conclusion, green fuels can help reduce environmental pollution from fossil fuels while utilizing existing pollutants to produce eco-friendly biofuels.