Artículo | 18 Dic, 2018

GrowGreen: Chinese cities grow and with it, the need for green

Blog by Claire Warmenbol. Worldwide out of the 47 megacities, China alone counts 17. These are cities with a population in excess of 10 million people. Today over half of the Chinese mainland population lives in cities. Towards 2030, China aims for 70% of its population, about 900 million people, to live in cities.

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Photo: Shutterstock/ESB

Such numbers can seem mindboggling and the ramifications of those urban transformations even more so. These cities require tremendous investments in water supply, waste treatment, energy, transportation and public utility provisions to provide for the growing number of urbanites. And those investments have an impact, particularly on nature.

As part of the GrowGreen project, we travelled to Wuhan in Hubei Province, China to explore opportunities for collaboration and exchange on Nature-Based Solutions (NBS) for urban centres between Wuhan and European cities.

The GrowGreen project aims to promote climate and water resilient cities by supporting the investment in NBS as part of urban planning by joining forces with cities and experts in Europe and around the world. It aims to influence and inspire solutions based on nature and therefore innovation and systems-thinking play a key part”, team leader Jonny Sadler, Programme Director of the Manchester Climate Change Agency.

Some key lessons we took home from the GrowGreen China mission:

1.Tapping into cities’ natural capital is a wise investment

In travelling by train from Beijing to Wuhan, we saw endless stretches of high-rise construction sites which will become new cities and towns where the 300 million Chinese now living in rural areas will be relocated to. The idea behind this is that the greatest potential for expanding domestic growth in China lies in its urbanization.

Whilst boosting domestic growth through expanding the number of spending urbanites may well be strategic, another cheaper and sustainable source for China to tap into for economic benefits, is nature. The ecosystem services provided by nature through for example, wetlands, forests and rivers, can help safeguard urban resilience, people’s health and wellbeing, as well as biodiversity and employment opportunities. Services can include carbon sequestration, water purification, flood mitigation, urban heat reduction, air filtration, and habitat provision to name but a few.

It makes good business sense too. Data shows that for example a 10% increase in tree canopy cover in cities may result in a 3–4°C reduction in ambient temperature and save large amounts of energy and costs in air conditioning during hot summer months.

China rapid urban development       Photo: ©IUCN\Claire Warmenbol

2. Sponge Cities are mobilizing nature in the defence line of climate change

Like many countries around the world, China is concerned about flooding as a consequence of a changing climate. Launched in 2015, the Sponge City Initiative invests in projects that aim to soak up floodwater and improve water quality. The projects are implemented in 30 cities across China. By 2020, China hopes that 80% of its urban areas will absorb and re-use at least 70% of rainwater. To date, these cities have received more than $12 billion for investment in sponge city projects.

Wuhan, China’s second fastest growing city with 11 million people, is located at the confluence of the Han and Yangtze Rivers. The city is at risk of flooding and the majority of the numerous lakes in the city have poor water quality. To address these issues, Wuhan is part of the Sponge Cities programme. In visiting some of the demonstration sites, we witnessed several types of green and urban spaces allowing for the infiltration and storage of rainwater, including rain gardens, permeable pavements, bioswales and detention ponds. The Sponge City target in Wuhan is set to 20% of the city by 2020, and 80% by 2030. Since its launch in 2015 Wuhan has already transformed huge areas of the city. Whilst focus is still very much on the external infrastructure fix, urban biodiversity and communities are benefitting too.

Floodwater detention pond, Wuhan, ChinaPhoto: ©IUCN/Claire Warmenbol

3. Cities that stick together, stay together…and get ahead

The Economist 2018 City Liveability Index -which considers 30 factors related to safety, health care, educational resources, infrastructure and the environment- found that 6 of the Top 10 scoring cities are in Australia and Canada. What these have in common are very low population densities. Yet Japan with a high population density also made it into the Top 10 with Osaka and Tokyo. Why is this important? Because each city and setting is different, but in learning from others what works and what doesn’t, cities can adjust, improve and thrive.

Wuhan city and the city of Manchester became sister cities in 1986. Whilst in Wuhan, the Manchester Climate Change Agency, University of Manchester, and IUCN met with the Wuhan City Council who has a cooperation agreement with the City of Manchester in urban development and smart city construction. For GrowGreen, the aim is to deepen this collaboration in the area of sharing innovation, both in green infrastructure and urban financing. The prospect now is to invite Wuhan to the GrowGreen Innovative Financing Conference for Green Cities in Manchester in March 2019 and share successes and lessons from their Sponge City Programme with counterparts in Europe.

Learning exchange on nature based solutions for cities, Wuhan, China       Photo: ©IUCN/Claire Warmenbol

In reflecting on GrowGreen and the exchanges in China, rapid urbanisation is certainly challenging but simultaneously laden with opportunities. In our day and age of communications and access to information, the sharing and learning potential on best practices and innovation between cities holds a lot of promise for a greener urban future.

To borrow a quote from Confucius, “By three methods we may learn wisdom: First, by reflection, which is noblest; Second, by imitation, which is easiest; and third by experience, which is the bitterest.” All three lead to wisdom but from our observations in Wuhan and its sponge city solutions, learning through reflection will benefit many, and this well beyond Hubei and China.

IUCN GrowGreen Project, Wuhan, China Nov 2018       Photo: ©IUCN GrowGreen


Blog written by Claire Warmenbol, IUCN Water Programme Communications Coordinator


Further information on GROWGREEN:

Through involvement with other city networks, including Eurocities, ICLEI, Chinese Sponge Cities and 100 Resilient Cities, numerous other cities will in the future be directly and indirectly supported through Grow Green.

Today seven cities are formal partners of GrowGreen: Manchester (UK), Valencia (Spain), Wroclaw (Poland), and Wuhan (China), Brest (France), Zadar (Croatia), Modena (Italy).

The European Commission Directorate General for Research and Innovation Horizon 2020 programme, invests in large scale demonstration projects for nature-based solutions for water and climate resilience in cities and is the main donor of the GrowGreen project.

IUCN is a partner in GrowGreen, along with

- Academic partners: University of Manchester (UK), University of Cambridge (UK), Wroclaw University of Environmental and Life Sciences (Poland), University of Valencia (Spain)

- Civil society partners: Tecnalia (Spain), Greater Manchester Combined Authority (UK), Leitat (Spain), Manchester Climate Change Agency

- Business partners: Bipolaire, Paisaje Transversal, Trinomics, The Guinness Partnership


For more information, please visit