Did I Imagined Too Much About Resources On Earth(From resource mining)

 I never know the depletion of some elements, fuels use by human, if people can calculate today amount of each elements , fuels left on earth they will definitely wonder and calculate amount of time the element, fuel will last for human usage, some very rare elements last for months, fuels, other standard elements last for years, that is why important to know amount of time fuels, elements last on earth, what about we started to experiment to make all types of plastics from carbon, hydrogen and other elements(if required) using machines from chemical industry and started to sell these plastics in small markets. Imagine if there is an element which only last for 1 year mining from earth if human using it for 27 years they need to search for another earth to mine it, which means human require 27 earths(plural of earths) to mine them. That is what on earth!