In Israeli desert, world's highest solar tower looks to future

In the middle of southern Israel's desert, engineers are hard at work building the world's tallest solar tower, reflecting the country's high hopes for renewable energy. Once completed in late 2017, the Ashalim Tower will rise to 240 metres (787 feet), taller than Paris's Montparnasse Tower and London's Gherkin, according to the Israeli government and the consortium building it. Covered in stainless steel, the square tower in the rocky Negev desert with a peak resembling a giant lighthouse will be visible from dozens of kilometres (miles) away.