LONG WAY TO GO: Compared to coal, gas produces around half the carbon dioxide and one-tenth of the air pollutants when burnt for power. Many countries are switching to gas, but we're still far from a low-carbon future.
FOUR years ago, the United Nations picked Dhanica May Camacho of the Philippines as the world's symbolic seven billionth baby in a bid to highlight the challenges of an ever-growing global population.
It was a prescient choice.
It means that we don't have to wait until the middle...