Preserving biodiversity

As citizens, scientists, corporate players and public authorities all become increasingly concerned about biodiversity loss worldwide, focusing their attention on an overall decline in species and the severe impact already felt by humans, the Group is taking action by stepping up implementation of solutions that significantly improve habitats’ ecological quality and features, both within its own scope of activity and within its customers’ field of action.
Our actions

Accelerating the implementation of biodiversity solutions

100% sustainable solutions

SUEZ is aiming to step up its role in protecting the environment and restoring our natural assets by taking action for the protection and rehabilitation of terrestrial, aquatic and marine biodiversity. To do this, the Group is accelerating its development of “100% sustainable” solutions characterised by their positive impact on the environment, i.e. on air, water and soil.

Solutions we already offer local authorities and industry:

  • Monitoring and environmental assessment tools
  • Ecological rehabilitation plans for sites
  • Based on Nature solutions, such as vegetated discharge areas
  • Action plans to tackle invasive plant species.

A positive impact on the Earth’s natural assets, one of the cornerstones of the Group’s value proposition

  • Optimised management and use of water resources
  • Rehabilitation of the Earth’s natural habitats through remediation
  • Promoting biodiversity
  • Alternative means of water production
  • Smart agriculture

Taking part in collective international initiatives

In France, SUEZ is a stakeholder in the Entreprises Engagées pour la Nature / Act4Nature France initiative led by the Office Français de la Biodiversité (French biodiversity agency). In so doing, the Group is renewing the commitment it has made to the National Strategy for Biodiversity since 2014. Abroad, the Group is also involved in the Act4Nature International initiative led by EpE (Entreprises pour l’Environnement), in conjunction with the Business for Nature coalition run by the World Business Council for Sustainable Development.

In 2019, SUEZ also joined “Alliance to End Plastic Waste”, an international association which brings together a number of industry players with the common goal of “zero plastic waste in our oceans”.

Action plans implemented at priority sites

Since 2008, operational action plans to boost biodiversity have been rolled out at priority sites in France and abroad. In 2019, SUEZ recorded implementation of action plans at almost 40% of its plants recognised as priority sites due to their location in protected areas.
Our global references

"La Marjal" urban park prevents flooding in Alicante (Spain)

Built in 2015 and managed by Aguas de Alicante (SUEZ), "La Marjal" floodable urban park is a multi-functional green space that protects the city of Alicante from floods caused by torrential rain. The aim of the park is to build the city’s resistance to climate change and provide outdoor leisure space for its residents.

The park, which was inspired by Mediterranean wetlands, reduces the impact on flooding and provides a wild area for fauna and flora. Consequently, numbers of local birds and flora are increasing, with currently over 90 bird species including protected species like the kingfisher. Guided tours and scientific bird-tagging sessions are held at the park.


“La Marjal” park received several awards in 2018:

  • Alicante won the “Sustainable City” award in the complete water cycle category for the “Sustainable management of La Marjal floodable urban park”.
  • The park was chosen by the Organisation for Economic Cooperation and Development (OECD) as an example of a city’s good governance to solve problems relating to water and climate change.

Rebuilding and restoring reefs using oyster shells in Port Phillip Bay (Australia)

The south coast of Australia has hundreds of bays and estuaries with important habitats such as shell reefs, mangroves, seagrass beds and salt marshes. These habitats provide vital environmental services that nature and humans need to survive – filtering water, producing fish, protecting river banks – but years of commercial dredging, overfishing and pollution threatened these habitats.

SUEZ partners with The Nature Conservancy to help rebuild the reefs using oyster shells collected from seafood restaurants. The aim of the project: less waste, a restored habitat for native species and economic advantages for the marine industry.

Oysters are an integral part of marine ecosystems, improving biodiversity by improving water quality. The Port Phillip Bay project involved collecting used oyster shells from local restaurants and wholesalers. After collection, the shells were dried to eliminate pathogens, mixed with limestone rubble and placed on the seabed where young oysters were then able to gather. Since the start of the project, 1.5 hectares of shell reefs have been restored and 60 tonnes of shells have been recycled.

Restoring marine habitats in Marseille harbour (France)

The Mediterranean Sea is one of the planet’s busiest waterways. It represents over 10% of the world’s marine biodiversity yet less than 2% of its marine surface. All maritime industries operate in the Mediterranean and most are expanding, resulting in definite signs of deterioration despite over 60% of the marine area being designated a protected zone.
To recreate an ecosystem to boost marine biodiversity, SUEZ designed and installed artificial habitats along the quays at Marseille’s Pointe Rouge marina in 2015. The nurseries imitate the Posidonia meadows in which young fish shelter from predators, feed and grow before heading out to sea. This solution helps to restore marine biodiversity, particularly when combined with ecological rehabilitation work on the marine environment. In Marseille’s Bay of Cortiou, for example, actions included planting bunches of Cystoseira algae by hand so that their heavy seeds (zygotes) spread and grow, boosting biodiversity.
Our local references

Creation of a wetland at the Shanghai Chemical Industry Park (China)

In 2017, SUEZ won a design contract for the ecological rehabilitation of wetlands at Shanghai Chemical Industry Park (SCIP). It is the Group’s largest wetland creation project, using the Dragonfly Zone concept and covering approximately 50 hectares.
The aim of the project is to rehabilitate the existing wetland to improve industrial wastewater treatment using a network of functional and natural wetlands. To meet the challenge of treating SCIP industry park’s salinated wastewater, coastal plant species with a high salinity tolerance were chosen for the wetland. This ecological engineering innovation helps to improve the quality of treated wastewater and boost the site’s high biodiversity.

Enhanced biodiversity through Chongqing Sponge City (China)

Chongqing has a sensitive and fragile ecosystem due to its unique topography. This creates flooding risk to its complex landscape and also risks to its natural ecosystem if rainwater and wastewater discharge are not properly controlled.

“Sponge city” helps improve the urban resilience to flooding risks, and also enhanced the natural ecology through the components of the sponge city. Through this, the urban population against flooding risks and the natural environment against pollution are protected.

Protection of Spotted Seals in Dalian Hengli Petrochemical Project (China)

Dalian’s Spotted Seal National Nature Reserve protects the critical habitats and ecological functions of spotted seals, a national second-class protected animal in China and an indicator species for the sensitive marine environment.
The Hengli Petrochemical Industry Park is 20km away from the Spotted Seal National Nature Reserve. We are conscious of the great significance of maintaining biodiversity while providing integrated solutions to wastewater treatment facilities in the Park. We introduced the “embedded wastewater treatment plant (WWTP)” model which ensures all environmental indicators achieve the most stringent standards and effectively reduce pollutants to protect the natural habitat of spotted seals. The embedded WWTP concept won the “Special Climate Prize” in the Innovation Awards for Franco-Chinese Team in 2017.

Enriching urban biodiversity in landfill restoration projects (Hong Kong)

Restored landfill sites are semi-natural habitats important for improving urban biodiversity. SUEZ has restored seven landfills in Hong Kong back into urban green space and currently manages them. Successful landfill restoration and management advances the ecological diversity and maximizes ecological value of urbanized areas.