The sun. It's just a matter of how to most efficiently harness this energy.
green energy source
The source of energy of plants is sunlight.
The energy source for the arctic is the cold weather
I would suggest hydro power, but it's not available everywhere. Otherwise wind power.
the type of grain that has the best energy source for your horse is wheat.
The strongest source of energy in "Green Lantern" is the green light of willpower, represented by the color green. This energy is harnessed by the Green Lantern Corps to create constructs and power their rings. It is considered one of the most powerful forces in the DC Universe.
green plants
sunlight, water energy and wind energy all are green energy sources. now a day produce energy from Tide and low tide of the sea.
Wind energy is the best energy,because you can't run out of wind.
yes
wind
fat