Sunlight: the ultimate renewable energy.
The efficient capture and storage of sunlight underpins all life.
We all know that plants do it. So does a whole kingdom of other living things who make their home in the soil. In-soil photosynthesis accounts for a very significant portion of all energy capture and storage done on earth. What may not be immediately obvious is that this natural biological energy capture and storage includes capture of light frequencies plants don't access.
By-products of in-soil photosynthesis include humus, water and a range of stored carbon compounds. We farm plants. This process farms the soil and water they need. A fabulous free renewable energy source with amazing long term benefits.