California drought to worsen, Nasa predicts
California has been hit by its worst drought in a century, leaving hundreds of households and landowners without water.
Authorities are drilling deeper and more often in search of ground water, but with little success.
Now experts say the problem is set to worsen, with Nasa scientists predicting the dry conditions could become "the new normal".
Alastair Leithead reports.
- From the section US & Canada