Drought-stricken California only has one year of water left, Nasa scientist warns

As backup supply dwindles, Jay Famiglietti says state has about one year of water left and calls for a more 'forward-looking process' to deal with crisis

Related: California farmers resign themselves to drought: 'Nobody's fault but God's'

As California experiences the fourth year of one of the most severe droughts in its history, a senior Nasa scientist has warned that the state has about one year of water left.