Thomas Malthus said this quote

“ Population, when unchecked, goes on doubling itself every 25 years or increases in a geometrical ratio. ”

Famous Quotes of Thomas Malthus

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In a state therefore of great equality and virtue, where pure and simple manners prevailed, the increase of the human species would evidently be much greater than any increase that has been hitherto known.

~ Thomas Malthus

I do not know that any writer has supposed that on this earth man will ultimately be able to live without food.

~ Thomas Malthus

The power of population is indefinitely greater than the power in the earth to produce subsistence for man.

~ Thomas Malthus

The superior power of population cannot be checked without producing misery or vice.

~ Thomas Malthus