Watch Click Season 22 Episode 44 Online

In the third of Click's special shows about the ways in which tech can help save the planet, we focus on construction - one of the biggest carbon emitters. We look at efforts to rethink building from the ground up. In Sweden, attempts are being made to manufacture CO2-free steel. In Finland, robots can help recycle building materials. And in Orkney, we witness the latest developments in making energy from sea waves.