Fertiliser is essential for feeding the world but at what cost? | Landline

Farmers will need to produce 70 per cent more food to feed the world by the middle of this century. Fertiliser has been a key driver of production and remains integral to farming today. But as Landline's Kath Sullivan reports, there are concerns about the environmental impact of commercial fertilisers. Subscribe: http://ab.co/1svxLVE
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