Robert Zubrin has an excellent piece in the New Atlantis about the false, but popular, fears of impending Malthusian holocaust:
There is a single ideological current running through a seemingly disparate collection of noxious modern political and scientific movements, ranging from militarism, imperialism, racism, xenophobia, and radical environmentalism, to socialism, Nazism, and totalitarian communism. This is the ideology of antihumanism: the belief that the human race is a horde of vermin whose unconstrained aspirations and appetites endanger the natural order, and that tyrannical measures are necessary to constrain humanity. The founding prophet of modern antihumanism is Thomas Malthus (1766-1834), who offered a pseudoscientific basis for the idea that human reproduction always outruns available resources. Following this pessimistic and inaccurate assessment of the capacity of human ingenuity to develop new resources, Malthus advocated oppressive policies that led to the starvation of millions in India and Ireland.
While Malthus’s argument that human population growth invariably leads to famine and poverty is plainly at odds with the historical evidence, which shows global living standards rising with population growth, it nonetheless persisted and even gained strength among intellectuals and political leaders in the twentieth and twenty-first centuries. Its most pernicious manifestation in recent decades has been the doctrine of population control, famously advocated by ecologist Paul Ehrlich, whose bestselling 1968 antihumanist tract The Population Bomb has served as the bible of neo-Malthusianism. In this book, Ehrlich warned of overpopulation and advocated that the American government adopt stringent population control measures, both domestically and for the Third World countries that received American foreign aid. (Ehrlich, it should be noted, is the mentor of and frequent collaborator with John Holdren, President Obama’s science advisor.)
As Zubrin notes, this is an important and persistent topic. The rest is here.