An Australian power company is planning to build the world’s tallest structure, in the name of a global campaign to encourage renewable energy use. Energy company Environmission plans to construct a solar tower in the middle of the Australian outback that would soar 3,300 feet into the air, or more than twice as high as the world’s tallest building, Toronto’s Canadian National Tower. The structure, which has the backing of the Australian government, is expected to cost about $500 million. Once completed, the tower will provide enough electricity for 200,000 homes and save more than 700,000 metric tons of greenhouse gases.