We’re building a New York-sized city every month. That’s worrying for our climate

Global construction efforts are accelerating at a staggering pace, with the equivalent of an entire New York City being built each month. This rapid expansion of infrastructure, while essential to meeting growing demands for housing, education, and workplaces, is raising serious concerns about its environmental impact. According to recent research, the construction industry contributes significantly to greenhouse gas emissions through both the production of building materials and the ongoing operational costs of maintaining structures. These emissions, referred to as "embodied carbon," pose a major challenge to global climate goals. The scale of construction activity is immense. Every day, approximately 96,000 new and affordable homes are required worldwide to address the issue of homelessness and substandard living conditions. In Australia alone, the government's National Housing Accord aims to create 1.2 million new, well-located homes between 2024 and 2029. However, even this ambitious target pales in comparison to the global need. As nations strive to provide adequate shelter and infrastructure, they must confront the associated climate consequences. Research conducted on office building construction in Australia highlights the magnitude of the problem. Currently, the country has about 170 million square meters of office space, with plans to add another 100 million square meters by 2049. Modeling the greenhouse gas emissions from these constructions reveals that Australian office buildings are projected to emit 138 million tonnes of greenhouse gases between 2024 and 2049. This figure equates to the annual emissions of 36 coal-fired power stations, underscoring the substantial contribution of the office sector to national urban emissions. Despite progress in reducing operating emissions, those generated by heating, lighting, and cooling, due to the shift towards renewable energy sources, the challenge of lowering embodied carbon remains formidable. Embodied carbon, stemming from the production of materials such as cement, which accounts for 8% of global carbon dioxide emissions, is particularly difficult to mitigate. The reliance on fossil fuel-based supply chains complicates efforts to achieve significant reductions in emissions from construction activities. The findings reveal a concerning trend: cumulative emissions from Australian office buildings exceed the emission pathways necessary to limit global warming to 1.5°C or 2.0°C. Only Tasmania, which relies heavily on renewable energy and has fewer office buildings per capita, maintains annual emissions consistent with the 1.5°C pathway. This discrepancy underscores the urgent need for comprehensive strategies to address the environmental impact of construction. Efforts to reduce embodied carbon in office buildings include adopting sustainable materials, improving energy efficiency, and implementing circular economy principles. These approaches aim to minimize waste and maximize resource reuse throughout the lifecycle of a building. By integrating these strategies, it is possible to significantly reduce the overall emissions associated with construction projects. The potential for such reductions offers hope for aligning building practices with global climate objectives. As the demand for new infrastructure continues to grow, the balance between meeting human needs and protecting the environment becomes increasingly critical. Addressing the challenges posed by embodied carbon requires innovative solutions and collaborative efforts across sectors. The path forward involves not only technological advancements but also policy reforms and shifts in consumer behavior to ensure that future developments contribute positively to both societal needs and planetary health.