tag:bbc.co.uk,2008:cps:playlist:mediaAsset:14447799 Wind farms: Climbing to the top of a turbine Science correspondent David Shukman describes the exhausting climb to reach the top of a wind turbine. 2011-08-08T17:25:15Z en News 14447799 99110 blocked tag:bbc.co.uk,2008:cps:advert:mediaAsset:14447799 tag:bbc.co.uk,2008:cps:ident:news:video:640x360 tag:bbc.co.uk,2008:cps:mediaAsset:14447799