Robert T. Malthus postulated in his population theory that

Robert T. Malthus postulated in his population theory that the population growth rate may out-grow the means of subsistence. In simpler terms, Malthus argued that if the population continued to grow unchecked, it would eventually surpass the ability of the Earth to produce enough resources (such as food, water, and land) to sustain everyone. This would lead to famine, disease, and other forms of suffering. Malthus believed that the only way to avoid this outcome was to limit population growth through measures such as celibacy, delayed marriage, and contraception.