Imagine a world where our cities don't just survive alongside nature, but actively thrive because of it. As our planet gets increasingly crowded, the way we design and build our urban environments is no longer just about sustainability – it's about creating a nature-positive future. But what does that truly mean, and how can we achieve it?
The world's population is exploding, leading to unprecedented urbanization. Experts estimate we need to build the equivalent of a city the size of Madrid every single week for the foreseeable future. This puts immense pressure on the construction sector. The challenge is clear: How do we build durable, energy-efficient, and resilient cities that work with, not against, our natural ecosystems?
Think about a city teeming with greenery, buzzing with biodiversity, and offering a fantastic quality of life – all while existing in harmony with the environment. Nature, after all, is a powerhouse. It absorbs half of the world's carbon emissions and forms the bedrock of our economies and livelihoods. So, how can we, as an industry and a global community, drive the creation of these next-generation, nature-positive urban centers?
According to Antonio Carrillo Doblado, Vice-President of Sustainability at Holcim, "Forward-thinking cities are now pioneering transformative solutions, enabled by end-to-end sustainable building systems. We are able to support them across the value chain, bringing nature into cities to help them build nature-positive spaces."
This brings us to a shared opportunity: building a nature-positive future together.
To construct the sustainable and resilient cities of tomorrow, innovative city leaders are fundamentally rethinking urban construction. They're increasingly prioritizing building solutions that offer exceptional performance while minimizing their carbon footprint and reducing the use of virgin materials. Take, for example, Holcim's ECOPact low-carbon concrete. This innovative material reduces embodied carbon emissions by at least 30% compared to traditional concrete, without sacrificing performance.
And this is the part most people miss: it's not just about using 'green' materials; it's about transparency and verification. Solutions like ECOPact are backed by Environmental Product Declarations (EPDs). These EPDs independently verify a material's environmental impact throughout its entire lifecycle. Holcim provides digital, on-demand EPDs for any concrete mix within minutes, allowing architects and planners to optimize designs and accurately report on sustainability performance from the initial tender process all the way through construction.
But here's where it gets controversial... Some argue that focusing solely on reducing carbon emissions is not enough. Shouldn't we also be prioritizing the preservation of existing natural habitats instead of simply mitigating the impact of new construction? Let us know what you think in the comments!
Beyond low-carbon materials, accelerating circular construction is absolutely crucial for meeting growing demand sustainably. Circularity ensures that materials stay in use for as long as possible and are effectively reused at the end of their life cycle. This vision is becoming a reality through urban mining – the process of recovering and repurposing materials from construction and demolition waste. Imagine turning old buildings into new ones!
Holcim's ECOCycle® circular technology recycles construction and demolition materials into new solutions and products, effectively scaling up the circular economy. The Recygénie housing complex in Paris, the world's first building constructed entirely from recycled concrete, is a powerful example of this principle in action. "We are actively working to build cities from cities by opening recycling centers in the metropolitan areas where we operate, scaling up the efficient and local use of resources," Carrillo Doblado explains.
Energy-efficient building and usage are also paramount. Considering that 80% of current structures are expected to still be in use by 2050, "energy-efficient repair and refurbishment is a non-negotiable step to reshape our cities and prolong the lifespan of buildings while significantly improving energy performance," Carrillo Doblado emphasizes.
Solutions like Airium® insulation, which utilizes mineral insulating foam, and PRB External Thermal Insulation Composite Systems (ETICS), significantly enhance both thermal and acoustic insulation. This improves the quality of life for residents while simultaneously reducing energy demand and lowering utility bills.
In the face of rising sea levels and increasingly frequent extreme weather events, our infrastructure must be built to withstand climate change while actively integrating nature into the urban landscape. "We must integrate durable solutions, like green roofing systems to reduce the urban heat island effect, and water-permeable concrete to reduce flooding risks. A city full of greenery and biodiversity is indeed better equipped to ensure the quality of life and resilience for its community," says Carrillo Doblado.
Green roofs, for example, provide vital natural habitats and offer passive cooling, reducing surface temperatures by 30–40% compared to conventional roofs. A study by Cardiff University even found that green roofs and walls can cool local temperatures by between 3.6°C and 11.3°C. ZinCo, founded in 1957, recognized this potential early on and has become a pioneer and innovator in "living" green solutions that bring nature into cities, allowing biodiversity to flourish while also providing effective stormwater management.
Permeable concrete plays a crucial role in building for resilience and harmony with nature. It rapidly absorbs rainwater and enables the swift drainage of water directly into the soil, promoting a natural aquifer recharge or allowing the water to be recycled. This significantly reduces the risk of floods, one of the most destructive natural disasters. Hydromedia, for instance, facilitates the ultra-rapid drainage of water directly into the soil, promoting natural aquifer recharge or enabling water recycling.
Around three-quarters of the world's largest cities are located along coastlines. By 2025, an estimated 410 million people in coastal communities could be at risk from flooding and rising sea levels. Shore protection systems for coastal and revetment areas provide essential stabilization and erosion control. Holcim's Xbloc is a coastal breakwater armor system that utilizes ECOPact low-carbon concrete, demonstrating a commitment to both environmental responsibility and structural integrity.
Through its comprehensive offering of integrated, high-value solutions, Holcim aims to support its partners – from public authorities and urban planners to architects and engineers – in accelerating the creation of nature-positive cities for generations to come.
What are your thoughts? Do you believe that focusing on 'nature-positive' solutions is the right approach to urban development, or should we be prioritizing other strategies? Let us know in the comments below!
