UN publishes plan to decarbonise built environment

14th September 2023

The UN Environment Programme (UNEP) has this week published a plan to decarbonise the world's buildings and construction sector using an “avoid-shift-improve” solution.

Rapid urbanisation means that the world needs to add buildings equivalent to the size of Paris every five years, with the built environment sector already responsible for 37% of global emissions.

However, in a new report, the UNEP offers policy makers, manufacturers, architects, developers, engineers, builders and recyclers a “three-pronged solution” to reduce “embodied carbon” emissions and negative impacts from the production and deployment of building materials.

The first principle is to ‘avoid’ waste through a circular approach, building less and repurposing existing buildings – which generates 50-75% fewer emissions than new construction – using less materials and those that have a lower carbon footprint, and facilitating reuse or recycle.

The ‘shift’ principle involves ethically and sustainably sourcing renewable, bio-based building materials, including timber, bamboo, and biomass, which could lead to compounded emissions savings of up to 40% in many regions in the sector by 2050.

While the ‘improve’ principle involves decarbonisation of conventional materials that cannot be replaced – mainly concrete, steel, and aluminium, glass and bricks – focusing on electrifying production with renewable energy, increasing the use of reused and recycled materials, and scaling innovative technologies.

The avoid-shift-improve solution also requires sensitivity to local cultures and climates, including the common perception of concrete and steel as modern materials of choice.

“Until recently, most buildings were constructed using locally sourced earth, stone, timber, and bamboo, yet modern materials such as concrete and steel often give only the illusion of durability, usually ending up in landfills and contributing to the growing climate crisis,” said Sheila Aggarwal-Khan, director of UNEP’s industry and economy division.

“Net zero in the building and construction sector is achievable by 2050, as long as governments put in place the right policy, incentives and regulation to bring a shift the industry action.”

Government intervention is required across all phases of the building life cycle – from extraction through to end-of-use – to ensure transparency in labelling, effective international building codes, and certification schemes, according to the report.

Investments in research and development of nascent technologies, as well as training of stakeholders in the sectors, are needed, along with incentives for cooperative ownership models between producers, builders, owners, and occupants to the shift to circular economies.

The report also highlights case studies from Canada, Finland, Ghana, Guatemala, India, Peru, and Senegal, demonstrating how decarbonisation takes places using the ‘avoid-shift-improve’ approach.

“The decarbonisation of the buildings and construction sector is essential for the achievement of the goal of limiting global warming to 1.5°C,” said Dr. Vera Rodenhoff, deputy director general for international climate action and international energy transition of the German Federal Ministry for Economic Affairs and Climate Action.

“By providing cutting-edge scientific insights, as well as very practical recommendations to reduce embodied carbon, the study advances our joint mission to decarbonise the sector holistically and increase its resilience.”

Image credit: Shutterstock

Transform articles

‘Eco-anxiety’ under the spotlight at IEMA Connect 2023

Turning ‘eco-anxiety into eco-action’ was discussed at IEMA Connect 2023 this morning, providing key research and tips to help sustainability professionals deal with feelings of environmental despair.

21st September 2023

Read more

The UN has published its first official ‘global stocktake’ of progress tackling climate change since the Paris Agreement, which shows that ambition and implementation “must be accelerated rapidly”.

14th September 2023

Read more

Almost half of UK adults feel worse about the climate crisis due to government policy, with one in six suffering with ‘eco-anxiety’, new research suggests.

12th September 2023

Read more

The UK needs a new public investment fund that provides green companies with finance in exchange for part ownership and a share of future profits, a think tank has suggested.

25th August 2023

Read more

Countries in the Global South are trapped in relying on fossil fuel production to repay debts, a new report from the charity Debt Justice claims.

22nd August 2023

Read more

A total of 25 countries – home to a quarter of the global population – face extremely high water stress each year, regularly using up almost their entire available renewable supply.

17th August 2023

Read more

A lack of expert staff at environmental organisations is undermining the UK’s government’s net zero and nature commitments, new research by the trade union Prospect has uncovered.

16th August 2023

Read more

UK households are installing solar panels and heat pumps at a greater rate than ever before, with a 62% year-on-year increase taking place over the first half of 2023.

15th August 2023

Read more

Media enquires

Looking for an expert to speak at an event or comment on an item in the news?

Find an expert