India, March 3 -- For over two centuries, the spectre of overpopulation has haunted global debates about food security, sustainability and the environment. Back in 1798, English economist and scholar Thomas Robert Malthus wrote An Essay on the Principle of Population, arguing that the human population will always grow faster than our ability to produce food. The catastrophe Malthus prophesied has yet to arrive, thanks to technological advances and human ingenuity. But his ideas still inform much of the conventional wisdom around the relationship between population growth and the climate crisis....