Question

we say fossil fuels will last only for a few hundred years comment

Answer 1

Yes it is true this is because fossil fuels are natural resources once they destroyed take several years to replenish back again. Just because of over use of these fossil fuels and because of the destructive activities performed by human beings the level of natural resources is coming down due to which in future the fossils 'll not be able to see. As it 'll take time to replenish back again.

Hope it helps...