Gaza bombardments intensify

Palestinians in northern Gaza are fleeing from Israel's heaviest bombardment to date. Meanwhile, Jewish and Israeli-Arab mobs have been fighting within Israel. Also in the programme: A company responsible for around a quarter of Lebanon's power supply has turned off its generators and we talk to one of the world's most prominent climate scientists about his devotion to curbing global warming. (Picture: Palestinians gather at the site of destroyed houses in Gaza. REUTERS/Mohammed Salem)