What if we started to undertake farming in cities intensively? Imagine, rooftops, vertical walls, specialized agri buildings, even road tops, and park sides, all being optimized for agriculture. The farmland released in rural areas could be returned to forests. Farming would probably become small-scale once again and would be more likely to be organic too. Most importantly, the costs of transport, logistics, refrigeration, transactions, would all fall, and so would the environmental harm.