3 ms·That's like a perpetual motion machine. Energy is wasted, there is no way around it.by hawski 6y agoThat's like a perpetual motion machine. Energy is wasted, there is no way around it.saagarjha 6y agoThe sun is a great source of free energy.hawski 6y agoBut not necessarily nutrients/fertilizers and most tractors and transportation today run on ICEs. So it's still not a free lunch.