Malthus Demon: Reference Source Wikipedia: The reference for Malthus Demon has been made as the demon, an Earl of Hell who commands 26 legions. The Earl has been depicted to bear the form of a crow.
The references have been taken from the book Clavicula Salomonis or the Lesser key of Solomon.
Thomas Malthus (1766-1834): Thomas Malthus was a British clergyman who published Essay on the Principle of Population. The book warns about the fast growing population that will make resources fall short over a period of time. Malthus also suggests remedies in his book, like birth control and abstinence from copulation. However, he is better known for listing three main checks on the population – famine, pestilence and war.
Malthus did not supported the idea of war and killing other humans outfront. According to him war was ineveitable because the population would require food supplies that were limited. Therefore he suggested birth control and other measure, which could prevent the war.
Malthusian Crisis, Catastrophe: It is refered to the conditions when the agricultural growth and productivity will be far less than the population demands, resulting in a disaster or catastrophe.