In recent years, South Koreans have opened a fabrics factory, hotels and several food processing plants, especially for ginseng, popular with Koreans.

CNN: 'The South's Guangdong'

"Because all the food in our supermarket will be grown on site we won't need a big processing factory to make packaging and we won't have to burn lots of fossil fuel to transport it across the globe, " he said.

CNN: Farm in the city could be supermarket of the future