Ascientist who first sounded the alarm about the growth of the human population and the ability of the earth to handle a large population of humans was?

Thomas Malthus

Explanation:

Thomas Robert Malthus, an English cleric, and scholar, published this theory in his 1798 writings, An Essay on the Principle of Population. He believed that through preventative checks and positive checks, the population would be controlled to balance the food supply with the population level.