Global fresh water demand will outstrip supply by 40% by 2030, say experts

“We need a much more proactive, and ambitious, common good approach," said Professor Mariana Mazzucato (UCL Institute for Innovation & Public Purpose) on a report she co-authored which calls for an overhaul of wasteful water practices around the world ahead of a UN summit.

Read: Guardian (2), More: BBC Radio 4 'World at One' (from 34 mins, 44 secs)