Heat

Take all the power stations in the United States. Together, they produce almost 5000 gigawatts of electricity - enough to boil several billion kettles simultaneously.

Now imagine building another five power stations for every one that already exists in the United States. That is about the amount of electricity generation that the world is on track to add over the next 20 years. And three-quarters of the new stations will use fossil fuels.

-- Energy agency warns of 'irreparable' damage