Geothermal energy (Used sustainably viable for billions of years)
Non-Terrestrial Solar Energy (Beamed to earth so long as the sun doesn't go out)
Tidal energy (Oceans never stop as long as the earth is turning and the moon is orbiting)
Matter/Antimatter (not technically unlimited but practically unlimited)
sun fuel electricity and friction
It is inside the fuel tank paired with the fuel pump.
what are the four sources of heat
Fat.
Quite simply, the Sun does not have unlimited fuel.
Well.. There's ketchup, mustard, HP sauce and errr BBQ sauce
Acquiring fuels from abroad can pose a national security risk.
Acquiring fuels from abroad can pose a national security risk.
There are a great many different sources of fuel depending on the thing being fueled. Cars are fueled by gasoline which comes from oil.
As a power source? Free fuel, no pollution, unlimited run time.
9CTKKR gives you unlimited fuel
To get unlimited donuts on The Simpsons Tapped Out you have to get four or more characters to perform a 24 hour task. When they are finished, make them do a one hour task and you will get unlimited donuts.