The building sector, responsible for an astonishing 37 percent of global greenhouse gas emissions, has been lacking climate-focused development funding,
With a new area the size of Paris under development around the globe every week, the construction industry contributes heavily to climate change. However, the sector has received only a fraction of environmentalists’ attention and of the funds allocated to combat emissions compared with other industries.
Until now, most of the focus has been made on reducing the “operational carbon” of buildings—the emissions created from heating, cooling and lighting, which are projected to decrease from 75 percent to 50 percent over the next few decades.However, the authors of Building Materials and the Climate: Constructing a New Future, argue that the bulk of potential emissions cuts lie in how buildings are constructed, and to what end. And now the team of experts are calling for the creation of a ‘circular material economy’ to facilitate the achievement of the goals set out in the Paris Agreement on climate. They outline three immediate pathways for decarbonization that require active support from all participants of the construction sector’s lifecycle–from materials producers, architects and designers to builders and property operators: In fact, the experts suggest that before building anything new, materials that exist already should take priority through reconstruction, refurbishment or repurposing. UNEP News The UN Environment Porgram advocates for the adoption of a circular economy approach to reduce the extraction and production of raw materials. This strategy calls for data-driven design processes aimed at using fewer materials and encourages the reuse of buildings and recycled materials whenever feasible. Until the middle of the previous century cities were erected using mostly renewable materials, with old structures reused in new projects.This approach emphasizes the use of ethically produced, low-carbon earth and bio-based building materials, such as sustainably sourced bricks, timber, bamboo, as well as ‘agricultural and forest detritus.’ The third pathway focuses on improving methods to radically decarbonize conventional materials like concrete, steel and aluminum. For example, production of steel, the backbone of modern architecture, could be transformed to use only renewable energy, the experts propose. They also said non-renewable, carbon-intensive materials should only be used when absolutely necessary, minimizing their environmental impact. Besides that, UNEP-led specialists believe that when designing new buildings, architects should keep in mind the ways to disassemble the structures and to reuse materials reducing thus the landfill burden. Addressing the industry’s carbon emissions is a complex web of different factors, involving numerous stakeholders, thus the report underscores the critical importance of developing new models for cooperation to drive the much-needed transformation in the sector. It is also clear that without significant funding and cooperation, the ambitious goal of achieving net zero emissions from construction by mid-century may remain elusive, with potentially devastating consequences for global warming.
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