The United Nations (UN) reported we have a 50% chance of exceeding 1.5°C of global heating in the next five years. Between the UN Climate Summit of COP21 in Paris and COP26 in Glasgow, the global economy consumed 70% more raw materials than the Earth can safely replenish. 
The planet thrives through circular, natural and regenerative systems, which are being damaged by the the impacts of the built environment:
- The built environment is responsible for 37% of global energy-related carbon emissions, and the construction sector accounts for around 40% of global resource demand. By 2050, two thirds of the global population will live in cities, consuming 75% of the world’s natural resources, producing 50% of global waste and over 60% of Greenhouse Gas (GHG) emissions. 
- Over one-third of the materials used worldwide are for buildings, but less than 9% of global materials consumed are circular, i.e. kept in productive cycles of use. 
- The impact of this resource use — associated GHG emissions and pollution and plunging biodiversity — accelerates climate change and the decline of life-sustaining ecosystem services such as the maintenance of clean water and productive soils.
The World Economic Forum’s definition of a circular economy:
“An industrial system that is restorative or regenerative by intention and design. It replaces the end-of-life concept with restoration, shifts towards the use of renewable energy, eliminates the use of toxic chemicals, which impair reuse and return to the biosphere, and aims for the elimination of waste through the superior design of materials, products, systems, and business models .”
WorldGBC’s Circularity Accelerator
As part of WorldGBC’s work to address the three key impact of areas of the built environment — climate action, health & wellbeing and resources and circularity — the Circularity Accelerator is a WorldGBC global programme to accelerate the adoption of circular economy and resource efficiency in the building and construction sector.
To support the ambitions of the UN’s Sustainable Development Goals and the Paris Agreement, the programme convenes a network of over 70 Green Building Councils and their 36,000 members to work towards WorldGBC’s circularity and resource efficiency goals:
2030 goal: The sustainable management and efficient use of natural resources within the built environment, achieving zero waste to landfill targets and working towards a built environment with net zero whole life resource depletion
2050 goal: A built environment with net zero whole life resource depletion, working towards the restoration of resources and natural systems within a thriving circular economy
In order to facilitate cross-sector collaboration, WorldGBC and partners will lead on the creation and distribution of technical knowledge on the circular economy, including developing training for GBC members and the wider industry, and supporting the use of rating tools alongside advocating for regulatory strengthening. This work will be initiated through a flagship ‘State of the Market’ report in Q4 2022.
The programme is supported by our dedicated project partners, sponsors, and collaborators, which includes Global Program Partners Ramboll, Brightworks, Foster + Partners and Technical Report Partners WSP.
Fuente: World Green Building Council