Renewable energy sources are starting to make a significant contribution to the world’s energy mix, while at the same time fossil fuels are falling out of favour due to pollution, climate change, high costs, and energy security reasons. Hw fast the transition to renewables takes place, the extent of the change, and what effect it will have on the growth of hydroponics remains to be seen.
Renewable energy is considered to be from energy sources that are renewable within a normal human lifespan, and there are really only three sources we can get this energy from. Solar energy from the sun, thermal energy from the earth, and energy from the effects of gravity - water running downhill…
Renewable energy comparison on page 21.