OK I'll rise to the bait
"renewable energy" is shorthand for energy derived from sources which are not depleted in our lifetimes - eg solar, wind, tidal - you use it today and it's still there tomorrow
Non Renewable energy is a gallon of gasoline or a ton of coal - you use it , it's gone. You can wait 2-3 million years for it to be replaced naturally or you can just continue to dpelte the resource - once it's all used up you abandon the oil well or the coal mine and try and find another.