New Scientist: COME 2030, electronic gadgets will gobble three times as much electricity as they do today, requiring 280 gigawatts of new generating capacity, unless we do something about it. A new study by the International Energy Agency (IEA) reports that devices from cellphones to personal computers consume 15 per cent of all household power, and that figure is climbing rapidly. Energy consumption could, however, be reined in using existing technologies. “If we were to use the most …