A Urban farming is often seen as a modern trend, but cities have always grown food. In the past, many households kept chickens and vegetable plots.
B Today, new methods are emerging. Vertical farms grow crops in stacked layers under LED lights, using far less water than fields. Rooftop gardens supply restaurants just a few floors below.
C Supporters say local growing reduces transport and gives residents fresh produce. Community gardens also bring neighbours together and improve wellbeing.
D Critics point out that vertical farms use a lot of electricity, and most only grow leafy greens and herbs. Staple crops such as wheat still need large areas of land.
E Most experts conclude that urban farming will not feed whole cities, but it can make food systems more resilient and help people understand where food comes from.