1. Ocean energy: Ocean energy can utilize ocean tides, waves, temperature difference and other energy sources, and has the characteristics of renewable and environmental protection.
2. Solar energy: Solar energy converts solar energy into electric energy through solar panels, which is a pollution-free renewable energy source.
3. Wind energy: Wind energy uses wind power to generate electricity, which is both environmentally friendly and economical.
4. Hydrogen energy: Hydrogen energy is an efficient and clean energy source, which is generated by water electrolysis. Only water is produced after combustion, and no pollutants are produced.
The development and utilization of these green energy sources are of great significance for protecting the environment, reducing carbon emissions and coping with climate change.