Deep in the earth, there are a quadrillion tons of diamonds. However, getting to them is expensive.
There is only roughly 50 years of most fossil fuels left on earth. However, there are many alternatives to fossil fuels that are cheaper to make than making synthetic fossil fuels: biodiesel or alterative forms of energy like solar.
So, it all comes down to “cost to get something done” when there are multiple ways to get something done.
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