People are planting tiny urban forests to boost biodiversity and fight the climate crisis

If your answer is bigger than a couple of tennis courts, think again. Miniature forests are springing up on patches of land in urban areas around the world, often planted by local community groups using a method inspired by Japanese temples.

The idea is simple – take brownfield sites, plant them densely with a wide variety of native seedlings, and let them grow with minimal intervention. The result, according to the method’s proponents, is complex ecosystems perfectly suited to local conditions that improve biodiversity, grow quickly and absorb more CO2.

The Miyawaki method

The method is based on the work of Japanese botanist Akira Miyawaki. He found that protected areas around temples, shrines and cemeteries in Japan contained a huge variety of native vegetation that co-existed to produce resilient and diverse ecosystems. This contrasted with the conifer forests – non-indigenous trees grown for timber – that dominated the landscape.

His work developed into the Miyawaki method – an approach that prioritizes the natural development of forests using native species. Miyawaki forests can grow into mature ecosystems in just 20 years – astonishingly fast when compared to the 200 years it can take a forest to regenerate on its own. They act as oases for biodiversity, supporting up to 20 times as many species as non-native, managed forests.

Local pollinators and amphibians are among the creatures that thrive with a greater diversity of food and shelter.

Greening urban spaces worldwide

The popularity of Miyawaki forests is growing, with initiatives in India, the Amazon, Europe and the United States.

The pocket forest company SUGi, a partner in the World Economic Forum’s Uplink initiative, has planted 160 tiny forests in 28 cities across six continents, including one it is funding at Danehy Park in Cambridge, Massachusetts on the site of a former landfill.

Projects like Urban Forests in Belgium and France, and Tiny Forest in the Netherlands, are bringing together volunteers to transform small patches of wasteland. Another Forum Uplink partner, Earthwatch Europe, has planted more than 200 small forests in the United Kingdom and mainland Europe.

Urban forests bring many benefits to communities beyond their impact on biodiversity. Green spaces can help to improve people’s mental health, reduce the harmful effects of air pollution, and even counter the phenomenon of heat islands in cities, where expanses of concrete and asphalt raise temperatures unnaturally high.

Carbon sinks

But it is the potential for helping to combat the climate crisis that makes Miyawaki forests a particularly attractive option for many environmentalists. Reforestation is a key part of strategies to limit the rise in global temperatures to 1.5?, with initiatives like the Bonn Challenge, Trillion Trees Vision and the World Economic Forum’s 1t.org project setting ambitious targets.

It’s estimated that new or restored forests could remove up to 10 gigatons of CO2 equivalent by 2050.

Source: World Economic forum