No. Nuclear energy is the most efficient in producing steam for use in engines. 15-20% of the energy in fossil fuels is lost up chimneys into the atmosphere, and is unusable. Solar and Wind energy farms cannot harness or convert effectively all the energy in the sunlight or wind and have much lower actual efficiencies. Fossil fuels presently are the cheapest and most reliable energy source available. Solar and wind energy are less reliable.
They have been the most efficient energy source available
Solar energy is a potential alternative for fossil fuels. It is a renewable source of energy and will be available as long as the sun lasts.
Depends on the source
Oil
They have been the most efficient energy source available.
fossil fuels can be used as an energy source to power all vehicles and most machinery
Nuclear energy that is the source of sun energy which in turn is the source of fossil and renewable energies.
Chemical energy
No it is its own source of energy
LEDs are the most energy-efficient lights as of 2016.
Fossil fuels.
Fossil fuels are exhaustible. Electric energy is an alternative.