We get enough water from rainfall in this country - especially the west- to irrigate Africa I reckon - all it needs is a national grid of mega pipes to distribute it sensibly.
Apparently if we did it would cause problems for the flora and fauna, crazy as it sounds, all plants etc. are used to local water conditions and would suffer, if given water from miles away, I kid you not, I heard it on Radio 4 so it must be true
I think if they spent less money giving shareholders bonuses, and more stopping pipes leaking it would be better
