High above the streets of New York, more than 36 tonnes of organic vegetables are grown every year. And the farms that produce them aren’t just feeding residents – they’re helping to stop sewage polluting the city’s rivers too.
Covering a total of 2.3 hectares (5.6 acres), the farms sit on top of three historic industrial buildings. Their soil is just 25 cm (10 inches) deep, but it absorbs millions of litres of rainfall each year – water that would otherwise flush straight into the city’s drains.
New York has long had a problem with what is known as Combined Sewer Overflow, where rainwater inundates water treatment plants causing the sewers to overflow directly into the Hudson and East River.
The city has made progress in recent decades, spending $45 billion since the 1980s on wastewater treatment to reduce discharges into waterways. But with more than 70% of its area paved and upwards of 8 million residents, the problem still occurs when it rains heavily.
Brooklyn Grange, which operates the three rooftop sites, built its first farm in 2010. It broke even in its first year, moved into profit two years later and now employs 20 full-time and 60 seasonal staff.
Its founders believe commercial urban agriculture can help cities become cleaner and greener. And they measure their success against a “triple bottom line” – profit, the environment and impact on people.
A buzzing project
Green roofs help urban areas reduce the heat that otherwise radiates on summer nights from conventional rooftops. That not only helps to make the city cooler in summer but also reduces the amount of energy needed to keep the buildings cool.
The rooftop farms use waste food to produce compost. Half their produce is sold to restaurants and they run two weekly markets and deliver locally through a community-supported agriculture scheme, which connects farmers directly to consumers. They are home to 40 beehives, too.
The farms have so far hosted 50,000 young people on educational visits to learn about sustainable city farming. They run public courses on everything from sustainable dye-making to making hot chilli sauces. They host yoga classes and even weddings.
The company has now expanded into designing and building mini farms and wild flower gardens for private clients across the city.
What is the World Economic Forum doing to improve the future of cities?
Cities represent humanity’s greatest achievements – and greatest challenges. From inequality to air pollution, poorly designed cities are feeling the strain as 68% of the world’s population is predicted to live in urban areas by 2050.
The World Economic Forum’s Platform for Shaping the Future of Urban Transformation supports a number of projects designed to make cities cleaner and more inclusive, and to improve citizens’ quality of life:
- Creating a net zero carbon future for cities
The Forum’s Net Zero Carbon Cities programme brings together businesses from 10 sectors, with city, regional and national government leaders who are implementing a toolbox of solutions to accelerate progress towards a net-zero future.
- Helping citizens stay healthy
The Forum is working with cities around the world to create innovative urban partnerships, to help residents find a renewed focus on their physical and mental health.
- Developing smart city governance
Cities, local governments, companies, start-ups, research institutions and non-profit organizations are testing and implementing global norms and policy standards to ensure that data is used safely and ethically.
- Closing the global infrastructure investment gap
Development banks, governments and businesses are finding new ways to work together to mobilize private sector capital for infrastructure financing.
Contact us for more information on how to get involved.
Almost 70% of the global population is predicted to live in cities by 2050. And while cities drive the global economy, they are also responsible for three-quarters of global CO2 emissions.
So projects like these will become ever more important, according to the World Economic Forum Global Future Council on Cities and Urbanization, if urban areas are to meet targets such as those set out in the UN's Sustainable Development Goals and the Paris Agreement on climate change.