Malthusian League was created in 1877.

Reverend Thomas Malthus believed that massive population growth would facilitate famine or disease. This phenomenon was called a Malthusian catastrophe. It was thought to cause an equally massive decrease in population.

The Malthusian Trap is the theory that, as population growth is ahead of agricultural growth, there must be a stage at which the food supply is inadequate for feeding the population.

a huge catastrophe

No, catastrophe is a noun.