New Delhi, June 26 -- FROM THE top of the slide, which curves into a little backyard pool, the view as recently as April would have been of lush Ohio farmland, dense forest and pretty clapboard houses. Now it is of six giant weatherproof tents of the type used by the armed forces to house fighter jets or by aid organisers in disaster zones. These will soon contain perhaps $30bn-worth of cutting-edge semiconductors. Along with a clutch of gas turbines to provide power, they occupy a site the size of an airport terminal. If Meta, the site's owner, stays on track to bring its "Prometheus" data centre online in 2026, it will dedicate an entire gigawatt (GW) of power-the amount needed to power as many as 1m homes, or roughly the output of a la...