People have been burning wood for centuries to provide themselves with heat energy.
It already is an energy source.It already is an energy source.It already is an energy source.It already is an energy source.
wood
Cheap source of energy
The Sun is the ultimate source of all energy on earth.
Carbon
The wood can be burned in a fire.
Wood, solar energy, wind.
Wood is the first discovered primary energy source. Some believe that Solar energy (as heat caused by sun light) is the first discovered primary energy source.
No. Solar energy comes from the sun.
biomass
true
Biomass