Human: Is it possible to create a sustainable energy source? Assistant: 
Yes, it is possible to create a sustainable energy source. There are many different types of renewable energy sources such as solar, wind, geothermal, biomass, and tidal power that can be used to generate electricity. These sources are all sustainable because they do not produce any harmful emissions or pollutants. Additionally, these sources can help reduce the reliance on non-renewable energy sources like fossil fuels.