It’s no surprise to find that a country that gets as much sun as Australia is keen to start using solar sources of renewable energy. Way out in the outback, a tower half a kilometer high will be built, surrounded by a two-mile-diameter canopy. The canopy will superheat the air, which will then flow up towards the lower pressure area of the tower and drive turbines. No fuels required, totally pollution free – and a great use for otherwise desolate land.