Scientists in Gulf of Mexico discover world’s biggest ‘dead zone’

Scientists in the Gulf of Mexico have just recorded the biggest “dead zone” in history – an area of water that does not have enough oxygen to support life.

It is the size of New Jersey and is largely caused by fertilisers running into rivers from farms across the United States.

Some farmers are now trying to make changes but one environmental group is blaming the meat industry,

Al Jazeera’s Andy Gallacher reports from Iowa.