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Stunning aerial footage shows Asia's largest rooftop farm which designers believe represents cities of the future - which will also fight climate change.

The 75,000 sq ft (7,000 metres) farm is built on top of the Thammasat University in the sprawling concrete metropolis of Bangkok, Thailand.

It mimics the layered rice terraces in the rural north of the country and is open to any residents who want to grow rice and vegetables, the region's staple food.

Designers, who unveiled the project this month, believe that rooftop farms will become the green cities of the future as urban populations grow and land becomes scarce.

Major cities including Paris and Singapore are adding similar rooftop farms to shopping malls and office blocks.