TOEFL Integrated Writing

Some urban planners argue that rooftop farms can make cities more sustainable. First, they say these farms reduce the distance food travels before it reaches consumers. If vegetables are grown on buildings near restaurants and markets, fewer trucks are needed, which can lower fuel use and emissions. Second, rooftop farms may help buildings use less energy. Soil and vegetation can provide an extra layer of insulation, keeping roofs cooler in summer and reducing the need for air conditioning. In dense cities, this could also help reduce the urban heat island effect. Finally, supporters claim that rooftop farms can strengthen local communities. Residents who work together to grow food may develop stronger social connections, and schools can use the farms as outdoor classrooms for environmental education.

The lecturer is cautious about the reading's claims. She says rooftop farms can help in some cases, but their benefits are often overstated. First, she challenges the transportation argument. Many rooftop farms produce small quantities of food and still need supplies such as soil, containers and irrigation equipment delivered by truck. As a result, the total transportation savings may be limited. Second, she questions the energy claim. A green roof can insulate a building, but rooftop farms are heavier and require structural support, watering systems and maintenance access. For older buildings, these upgrades can be expensive and may cancel out the energy savings. Third, she agrees that community benefits are possible, but she says they are not automatic. If a rooftop farm is managed by a private restaurant or company, local residents may have little access to it. Community value depends on how the project is organized, not simply on the presence of plants.