We are also far less likely to die from the side-effects of economic development and the burning of cooking and heating fuels. In 1900, one person in 550 globally would die from air pollution every year, an annual risk of dying of 0.18pc. Today, that risk has fallen to 0.04 pc, or one in 2,500; by 2050, it is expected to have collapsed to 0.02pc, or one in 5,000. Many other kinds of pollution are also in decline, of course, but this shift is the most powerful.