Great States 415-16
The power source behind our mowers hasn't changed much in 100 years.
It's still readily available on demand. You can still fuel it for the price of a banana and a glass of milk.
It always works when you want it to, and it doesn't leave any residue for the environment to absorb other than a couple of foot prints in a perfectly cut lawn.
People- the power behind our mowers in 1895, and the power behind them today.