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4 votes
This is a is a natural substance that cannot be re-made, re-grown, or regenerated as fast as it is used.

User Kriszta
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2 Answers

3 votes
Random guess, but oil/coal? It takes millions of years to form and people are using it up really quickly
User Mehret
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4 votes
Fossil Fuels is a perfect example
User Solomon Vimal
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