Can the world rely on renewable energy , Future Earth, BBC News

What are the challenges the world faces in the transition to renewable energy and what are the possible solutions The BBC s Carl Nasman learns about the US first 100 renewablepowered city; the worlds largest solar farm; and the research project literally getting energy from thin air. This is episode three of Future Earth, a series exploring todays most important developments in climate science and sustainability. For more climate news and hopeful developments, subscribe to the Future Earth newsletter here: 00:00 Sealing off abandoned oil wells 05:47 World s largest solar farm 11:00 America s first 100 renewable energy city 14:37 Decarbonising aviation 21:19 Sand batteries 22:22 Harnessing subway heat , FutureEarth, Climate, BBCNews