Its coal and hydrogen
Coal is the most used source for electricity in the US. World wide, other countries, I don't know.
No, coal is.
Wind
Hydropower
Its coal and hydrogen
The correct order of US energy consumption by source from most to least is petroleum, natural gas, coal, renewable energy, and nuclear energy.
most likely, it's coal
most likely, it's coal
Oil
Biomass is the source of almost half of America's renewable energy.
most likely, it's coal
it could be a very efficient energy source but it cant be used in most places unfortunatley D: