Comment: Contrary to popular belief, farmers can not produce whatever food they want on their land, and if they can - it costs them money, writes Dr Jacqueline Rowarth.

Farmers can do many things – but they cannot do all things.

Contrary to the belief of some vegans, they cannot produce whatever food they want on their land.

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Climate and topography determine what is possible, in conjunction with prices and costs.

In general, farmers and growers in New Zealand have identified the food, whether plant or animal,

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