Mayors are already leading the response to the climate emergency by setting science-based targets compatible with keeping the global temperature rise to 1.5°C, and they are taking impactful action to reduce local emissions from buildings, energy, transport and waste. 27 C40 cities have already peaked their production emissions - those emitted locally.
However, the C40 network represents one-quarter of the global economy, and 85% of the emissions associated with goods and services consumed within their boundaries are imported from elsewhere.
The place to start is with those who consume the most. To reach the reductions needed, high-income urban areas must reduce the climate impact of consumption by two-thirds within the next decade, while rapidly developing economies must adopt sustainable consumption patterns as they continue to grow. Many C40 citizens still don’t consume enough to meet their basic needs, so ensuring a just transition, and that reduction of consumption-based emissions is fair, will be crucial.
“Stopping the climate crisis requires keeping global temperature rise to below 1.5°C above pre- industrial levels. Transforming the global economy to deliver on that goal will require action on a scale never seen before in peacetime. Everything and everyone will have to change, but the first step is understanding what needs to be done. This research clearly demonstrates that changing the way we consume could make a significant contribution to cutting emissions,” said Mark Watts, Executive Director of C40 Cities.
“This is a wake-up call for all leaders, business, and citizens to consider both the local and global climate impact of the things they consume, and an opportunity to better engage citizens and businesses in solving the climate emergency. ”
The report explores six sectors where leaders, businesses, and citizens in the world’s cities can take rapid action to address consumption-based emissions: food, construction, clothing, vehicles, aviation, and electronics. There is significant potential to cut consumption-based emissions in these sectors.
Together these actions would save around 1.5 GtCO2e per year by 2030. When combined with existing city climate commitments, this would deliver 35% of necessary reductions in consumption-based emissions needed to put C40 cities on a 1.5°C trajectory. This shows that mayors, business and citizens can together make a big difference on consumption. Specific opportunities for cities include:
Food: Mayors, business, and citizens in C40 cities could together take actions to reduce consumption-based emissions from food by an average of 31-37% by 2030, depending on the target level, by moving to a plant-based diet, eating healthy quantities and avoiding waste.
Construction: Mayors, business, and citizens in C40 cities could together take actions to reduce consumption-based emissions from buildings and infrastructure by 26% by 2030.
Clothing: Mayors, business, and citizens in C40 could together take actions to reduce consumption-based emissions from clothing and textiles by 39% by 2030 through interventions such as encouraging new clothing business models focused on recycling, upgrading, renting, and reuse of clothes.
Vehicles: Mayors, business, and citizens in C40 cities could together take actions to reduce consumption-based emissions from private transport by 28% by 2030.
Aviation: Mayors, business, and citizens in C40 cities could together take actions to reduce consumption-based emissions from aviation by 26% by 2030.
Electronics: Mayors, business, and citizens in C40 cities could together take actions to reduce consumption-based emissions from electronics and consumer goods by 18% by 2030 by prolonging the lives of products ideally for at least 7 years, saving money and waste.
The changes to current consumption patterns that need to be delivered in cities are in some cases dramatic, but individuals, businesses and city governments all stand to gain if the changes are delivered in the right way.
Mayors, national governments, business, and individual consumers must work together on immediate and ambitious action to decarbonise global supply chains, shift to sustainable consumption practices, and transition to a low-carbon economy. Updating national targets to initiate an accelerated transformation of global production with increased decarbonisation of electricity, energy efficiency, shifts to low-carbon fuels in our buildings and transport, and less carbon-intensive industrial processes (particularly cement, steel and petrochemical manufacturing) will deliver 95% of the necessary reductions by 2050.
"There is a growing consensus, based on compelling evidence, that we face a climate crisis and rapid action to reduce greenhouse gas emissions is a necessity,” said Professor John Barrett, Chair of Sustainability Research at the University of Leeds.
"Cities have a unique opportunity to deliver mitigation options in addition to national action. Cities can clearly reduce their direct emissions from heat, electricity and mobility inside the city as well as reduce the emissions that occur outside the city due to its residents' consumption patterns. This report documents the carbon footprint of key global cities as well as analyses a range of strategies and policies that can be implemented at the city level."
To date, Arup and C40 have worked together on more than 25 projects affecting hundreds of climate actions in C40 network cities. Projects have ranged from research on science-based climate targets for cities, data analysis and reporting on climate actions, to technical support to cities in the areas of low carbon energy, building energy efficiency and sustainable transportation.
Download The Future of Urban Consumption in a 1.5°C World