Nothing happens without energy.
The Sun supplies the energy that powers all life on Earth. The oil, gas and coal that power human activity are in reality simply Solar Energy that was captured and stored millions of years ago, just as plants today continue to capture and store it. But the supply of these fossil fuels is finite. For example, in the last century, humans have consumed nearly half of all of the oil that will ever be produced. Consider this in the context of 5000 years of human history.