By Vaishali Aggarwal

A Dutch property company, Beladon, launched the world's first "floating farm" in a city port.

It has built the offshore facility right in the middle of Rotterdam's Merwehaven harbour and will use it to farm 40 Meuse-Rhine-Issel cows milked by robots.

Built-up urban areas may not seem like the most sensible places to run farms, but reducing the distance food travels before it reaches consumers' plates makes environmental sense as it reduces transport pollution.

And if the global population grows to 9.8 billion by 2050 as expected, 70% are forecast to live in cities – up from 55% today.

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