water _ that the next great conflict will be water resources. i'm an optimist and i water resources. i'm an optimist and i have _ water resources. i'm an optimist and i have great— water resources. i'm an optimist and i have great faith. if you to countries _ i have great faith. if you to countries like israel, you'll meet these _ countries like israel, you'll meet these incredible companies that have really— these incredible companies that have really learned how to maximise water usage. _ really learned how to maximise water usage. and _ really learned how to maximise water usage, and that includes reuse, much more _ usage, and that includes reuse, much more efficient use of water in agriculture. here in rainy london, london _ agriculture. here in rainy london, london is — agriculture. here in rainy london, london is a — agriculture. here in rainy london, london is a relatively dry city despite — london is a relatively dry city despite the fact that it seems to rain permanently. we have the opposite — rain permanently. we have the opposite problem based on our 19th—century drainage system, we 19th—century drainage system, we 19th—century pipes. we leak a huge amount— 19th—century pipes. we leak a huge amount of— 19th—century pipes. we leak a huge amount of water, so just 19th—century pipes. we leak a huge amount of water, sojust investing in the _ amount of water, sojust investing in the infra — amount of water, sojust investing in the infra structure that carries water— in the infra structure that carries water could make a big difference even when you think water wouldn't be a problem. a even when you think water wouldn't be a problem-— be a problem. a lot of rain but a lot of it going — be a problem. a lot of rain but a lot of it going to _ be a problem. a lot of rain but a lot of it going to waste. - be a problem. a lot of rain but a lot of it going to waste. park - lot of it going to waste. park brought up something interesting that agriculture within the us could be at the heart of this — which brings me to my next story. may be