question on natural substances for assignment (1 Viewer)

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hey, i need some help with this question.

it suppose to be easy but it says "Search out info about one natural substance or material that is in common use today and their demand is increasing so rapidly in the future that it is likely to outstrip supply"

i was thinking of doing fertilizers but i don't think that's a recent idea... because guano was used long long time ago and then synthetic fertilizers were used around WW2. so then i thought about antimalarial drugs but then synthetic ones are already produced around the same time.

so am i wrong or right? what else do you think i should do? i tried books and the net and they all the same thing e.g. ivory, timber, fertilisers, rubber etc etc

help please? = S
 

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