Mathusian n. : A follower of Malthus.

Example:
Nonoautonomous Mathusian Growth Model Problem?

Taxonomy
population, Malthusian catastrophe, fertility, human population, population growth, Malthus, Malthusian theory, theory, energy, developed countries, ratio, growth rate, exponential growth, arable land, fertility rate, food, Moscow, Neo-Malthusian.

Defination from the web:
Malthusian catastrophe are very similar to the subsistence theory of wages. ... physics professor Albert Bartlett, a modern-day Malthusian, has lectured on "Arithmetic, Population and Energy" over ...