Life has always been hotter in cities. Concrete soaking up and radiating sunlight, and the concentration of people, cars and machinery crank up the temperatures, making them on average 5–9°C warmer than rural areas.
This has led to fast growth of power-hungry air conditioning units delivering cooling. The problem is that this cooling has been pumping out excess heat and greenhouse gas emissions, which warm the planet and so lead to an ever-greater need for cooling.
Cities will still have to keep their citizens cool. We have already witnessed growing heat waves, both in frequency and amplitude. They severely affect the functioning and health of cities and their citizens. Rising temperatures contribute to heat-related deaths, reduced workforce productivity—estimated at 2.2 per cent of working hours lost worldwide by 2030—and poor air quality, which disproportionately affects the poorest communities. Rising temperatures mean that 1.6 billion people could face average summer temperature highs of 35°C by 2050, approximately 1.4 billion more people than today.
We need better ways to keep cool.
“About 40 per cent of energy consumed by buildings worldwide is used for space heating and cooling,” said Martina Otto, who heads the secretariat of the Global Alliance on Buildings and Construction at the UN Environment Programme (UNEP). “Space cooling is amongst the fastest-growing building end uses, and with higher temperature, more urbanites and rising standards of living, we will need a multiplicity of solutions to provide thermal comfort and protect human health.”
Active cooling needs to be cleaner and more efficient while we design buildings for more passive cooling and include nature-based solutions in buildings and cities’ public space. And we need to shift from the notion of cooling down space to providing thermal comfort.
Cities already starting to deliver
There are global and local efforts to address the energy efficiency and climate impact of the cooling sector, in particular through the Kigali Amendment to the Montreal Protocol. These actions can make a huge difference, but cities can do a lot more.
The Cool Coalition—a global network connecting over 80 partners—is working towards a rapid global transition to efficient and climate-friendly cooling. It will work with C40 cities and its network of more than 90 members to share expertise and integrate urban cooling into their climate action plans, as well as with the GlobalABC, who issued a call: “Buildings—keeping cool, naturally”.
By implementing clean cooling strategies, cities can not only reduce the demand for cooling but align their policies with other areas of importance, such as air quality, public health and energy resilience.
Cities are working on innovative solutions, and C40 cities are delving deeper into them as they meet in Copenhagen this week for the C40 World Mayors Summit. These range from scaling up district cooling initiatives to cool roofs and green roofs and facades, to urban landscaping with nature-based solutions such as green corridors, a well-articulated offer of green public spaces.
“Cities have a critical role to play in delivering efficient, clean cooling for their citizens” said David Aitken, Director, Innovation at Cool Coalition partner the Carbon Trust. “In their role as a facilitator, planning authority, asset owner and financier, cities have many levers to pull that can influence the way cooling is produced and consumed. Taking action on cooling at the local level will also leverage co-benefits relating to health and wellbeing, air quality and living standards.”
There are examples from all over the world.
Following the 2010 heatwave, Ahmedabad in India developed a plan for cool roofs, awareness raising and cooling stations. Since 2013, the city has avoided an estimated 1,100 deaths per year. It has acted as a blueprint for 30 cities in India, who have now released or are developing their own plan.
As part of their commitment to the Paris Climate agreement, Melbourne, Australia is banking on nature-based solutions. The goal is to plant 3,000 trees—which provide shade, reflect sunlight and release moisture into the air through their leaves—every year and cool the city by 4°C.
Copenhagen, Denmark, uses seawater in its district cooling system, reducing CO₂ emissions by up to 30,000 tonnes per year. The goal is to expand district cooling further and contribute to Copenhagen’s target of becoming CO2-neutral by 2025. Other initiatives in Copenhagen include green roofs for municipal buildings and a smart city energy lab that demonstrates how electricity and heating, energy-efficient buildings and electric transport can be integrated into an optimized system.
Cool roofs and new building materials on the rise
Cool roofs are gaining traction globally. Through its CoolRoofs Initiative, New York City has already painted more than 5 million square feet of its roofs with a reflective coating. Meanwhile, the Global Cool Cities Alliance has launched the Million Cool Roofs Challenge, a US$2 million global competition to rapidly scale up the deployment of highly solar-reflective roofs in developing countries.
“The concept of cool roofs is simple, but implementation faces barriers in the global south,” said Kurt Shickman, Executive Director of the Global Cool Cities Alliance. “We need to raise awareness of the opportunity. The availability of coatings and other cool roof solutions is often limited or non-existent. There is a lack of financing and investment. The Million Cool Roofs Challenge seeks to address each of these challenges.”
Green roofs and facades provide thermal insulation and help clean the air by trapping particulate matter. They offer the opportunity for urban agriculture and onsite wastewater treatment, adding further benefits. Bio-based building materials, which have a lower climate impact than concrete and store less heat, also offer real potential to improve the building envelope. While concrete has a high thermal mass, it’s extremely energy intensive to produce: 8 to 10 per cent of the world’s CO₂ emissions come from cement. “Alternatives such as bio-based materials are increasingly being used and can help reduce environmental impacts, while also providing the desired thermal mass,” said Otto. “For example, we have engaged in a partnership with Yale University to explore the use of such alternatives, from certified timber to bamboo and use of agricultural waste products such as coco fibre.”
It is clear that cities have a wide menu of options to choose from. They can walk the talk through public procurement decisions regarding their own buildings, set performance standards, use their planning authority and enter into partnerships with the private sector. By taking advantage of these options, cities can turn down the heat in the city and help put the world on track for a cooler future.
Guterres promotes ‘enormous’ benefits of greener cities
For the UN Secretary-General, the benefits of making cities more environmentally friendly are “enormous”, and include reduced climate risk, more jobs, and better health and well-being.
“City leadership in using green materials and constructing energy-efficient, resilient buildings powered by renewable energy, is essential to achieve net-zero emissions by 2050,” said António Guterres in his message for World Habitat Day, marked on Monday.
The theme for this year’s celebration of cities and towns worldwide is Accelerating urban action for a carbon-free world.
Cities are responsible for about 75 per cent of the world’s energy consumption and over 70 per cent of global greenhouse gas emissions.
Urban areas across the globe are facing the dual crises of COVID-19 and climate change, said the UN chief.
Around 4.5 billion people live in cities today, but that population is projected to grow by almost 50 per cent, by 2050. By mid-century, over 1.6 billion urban residents may have to survive through average summertime highs of 35 degrees Celsius.
For Mr. Guterres, cities and towns are at the core of climate action to keep the 1.5 degrees goal within reach.
“Three-quarters of the infrastructure that will exist in 2050 has yet to be built,” he said. “Economic recovery plans offer a generational opportunity to put climate action, renewable energy, and sustainable development at the heart of cities’ strategies and policies.”
As populations grow in emerging economies, demand for transport, which accounts for nearly 20 per cent of global carbon emissions, is also multiplying.
The UN Chief said cities are already working on this, trying to ensure that this demand is met by zero-emission vehicles and public transit.
Mr. Guterres concluded asking for a global moratorium on internal combustion engines to underpin these efforts, saying it should happen by 2040 at the latest.
In a message for the day, Executive Director of UN-Habitat, Maimunah Mohd Sharif, said that, unless the world takes urgent action, “the greenhouse gases produced by ever expanding urban centres, will continue to push global air temperatures higher.”
Ms. Sharif remembered that, this year, the day is celebrated only weeks before the UN climate change summit, COP26, happening in early November in Glasgow.
For the UN-Habitat Chief, the recovery from the COVID-19 pandemic is an opportunity for the world’s cities to put climate action on top of their agenda.
“This is a chance to change how we generate our power, construct our buildings, heat, cool and light up our offices and homes, and travel around from home to work,” she said.
Ms. Sharif asked for “well planned and well managed compact cities”, that allow for non-motorized transport and that reduce energy consumption from cooling and heating.
“Cities are the incubators of innovation and new technology,” she said. “We must harness this strength for better climate change solutions.”
For Ms. Sharif, “action will differ from city to city”, but “the green transition must benefit everyone, especially the most vulnerable, and create new jobs.”
Events this year will explore how governments and organizations can work together with communities, academic institutions and the private sector to create sustainable, carbon-neutral, inclusive cities and towns.
World Habitat Day will also amplify the Race to Zero Campaign and encourage local governments to develop actionable zero-carbon plans in the run up to the COP26.
This Monday, in a ceremony in Yaounde, Cameroon, UN-Habitat will also present the winners of the Scroll of Honour awards, one of the world’s most prestigious prizes for those working on sustainable urbanization.
This year, there are five winners: New Urban Communities Authority, from Egypt; Shining Hope for Communities, from Kenya; Baoji City, from China; Let’s do it World, from Estonia; and Ciudad Emergente, from Chile.
City Climate Finance Gap Fund completes first year of operation
The City Climate Finance Gap Fund (the Gap Fund) has approved technical assistance for 33 cities across the developing world since its operational launch in September 2020, filling a critical gap in technical assistance funding to help cities turn their climate ambitions into finance-ready projects.
Marking its one-year operational launch anniversary today, the Gap Fund has received over 140 expressions of interests and approved technical assistance for 33 cities in India, Mexico, Ethiopia, Morocco, Democratic Republic of Congo, Panama, Senegal, Vietnam, Kosovo, Montenegro, Ecuador, South Africa, Vanuatu, Colombia, Indonesia, Brazil, Guatemala, Uganda and Ukraine. An additional 30 cities are currently undergoing a detailed assessment for potential Gap Fund support, with a total target of at least 180 cities.
The Gap Fund is currently capitalized at €55 million, with a target of at least €100 million and the potential to unlock an estimated €4 billion in investments. The aim is to help cities understand their exposure to climate challenges, develop plans and strategies to reduce emissions and vulnerability to climate risks, and identify and prioritize climate-smart urban infrastructure investments.
The Gap Fund demonstrates a unique collaborative model: With funding from Germany and Luxembourg, the Fund is co-implemented by the World Bank and the European Investment Bank in partnership with the Deutsche Gesellschaft für Internationale Zusammenarbeit and works directly with city groups and networks including GCOM, ICLEI, C40 and CCFLA. This concerted effort has helped raise awareness about the importance of cities and urban systems in the climate agenda and could not come at a more critical time, as the latest Intergovernmental Panel on Climate Change (IPCC) report confirms that cities are the hotspots of global warming, with the global urban climate finance gap estimated in the trillions of dollars, especially in South Asia and Sub-Saharan Africa.
The Gap Fund also contributes cutting-edge knowledge, tools and recommendations. For example, by featuring in theState of Cities Climate Finance Report Part 2: Enabling Conditions for Mobilizing Urban Climate Finance, whichprovides critical systems-level conceptual frameworks and recommendations for city, country and climate decision-makers. The Gap Fund has also developed or packaged user-friendly practical tools and notes for operational practitioners and project developers on the ground.
The way cities develop in the coming years, especially in these regions, will influence the trajectory of future greenhouse gas emissions, and the susceptibility of cities to increased flood risks and urban heat island effects. The focus on cities is also reflected in the World Bank’s Climate Action Plan, which has identified cities and urban systems as a focus area on a par with energy, transport, food and industry.
Some of the Gap Fund’s most recent grant activities include:
- San Miguelito, Panama: Identify climate-smart and energy-efficient urban interventions for new cable car infrastructure, with the potential to cut emissions and reduce vulnerability to floods.
- Dakar, Senegal: Integrate low-carbon and climate-resilient considerations into the planning, development and construction of affordable and green housing in the greater Dakar region, including piloting a green building certification incentive for building developers.
- Mangalore and Kolar, India: Prepare a climate diagnostic report for solid waste management as well as an action plan for improving and financing low-carbon solid waste management services, including a pre-feasibility study.
- Bogota, Colombia: Provide technical assistance for greenhouse gas and air quality analytics, city-wide coordination and recommendations to incorporate low-carbon and climate-resilient considerations in the Low-Carbon Vital Neighbourhoods in Bogota– the first pilot in Latin America to implement a “Proximity City Urban Development Model” (also known as the 15-minute city model).
- Chefchaouen, Morocco: Prepare a study on low-carbon solid waste management activities including waste sorting, biogas recovery, leachate treatment and the use of solar energy.
- Vinnytsia, Ukraine: Support climate change adaptation measures along the Southern Bug River, such as new green spaces along the embankments, development of beaches to improve river transport and the construction of a new bridge to improve walking routes north and south of the city.
- Campinas, Sao Paolo State, Brazil: Promote climate change adaptation and reduce flood risks through nature-based solutions along the Capivari river.
- Danané, Côte d’Ivoire: Support the deployment of a fleet of 600 low-carbon, low-cost solar tricycle taxis to meet the city’s most pressing mobility needs for people, including expectant mothers, and cargo.
- Escuintla, San José and Iztapa, Guatemala: Assess the quality of existing waste generation and characterisation data of municipal solid waste and make any necessary additions, compare organic solid waste treatment alternatives and suggest improvements to the existing organisational structure and governance.
- Santa Marta, Colombia: Improve and enhance the city’s urban forest and forest management, and identify funding opportunities at regional, national or international level as well as links to other potential natural infrastructure projects along Santa Marta’s ecological corridors.
- Rio de Janeiro, Brazil: Improve hydrological modelling to assess urban flood risks and economic modelling to assess the viability of restoring wetlands as a natural barrier in flood-prone areas and carry out stakeholder consultations.
- Makindye Ssabagabo, Uganda: Study existing waste generation, carry out a characterisation study of municipal solid waste using random and seasonal data, and compare organic solid waste treatment alternatives.
- Palembang, Musi Rawas and Lubuklinggau cities, Indonesia: Prepare a cost-benefit analysis, strategy and action plan for green, resilient construction and energy-efficient affordable housing in these three cities. Project would help inform the national Government One Million Housing program which aims to provide incentives for developers to build 220,000 homes per annum and to upgrade 160,000 affordable homes.
WEF Launches Toolbox of Solutions to Accelerate Decarbonization in Cities
With the percentage of people living in cities projected to rise to 68% by 2050, resulting in high energy consumption, greater infrastructure needs and, carbon emissions, cities have a critical role to play in the race to reach net zero. To help address this challenge, the World Economic Forum, is releasing today the first iteration of its Toolbox of Solutions, designed and built in collaboration with Accenture.
The toolbox is an interactive digital platform containing more than 200 practical solutions to help city leaders, national governments and businesses evaluate and identify optimal solutions for near-term implementation, kick-starting their decarbonization journey. The first-of-its-kind toolbox draws on input and case studies from more than 110 cities, businesses, academics, civil society leaders and other urban stakeholders around the world and across sectors to capture best practices and case studies for urban transformation and decarbonization.
The solutions include policy, business and finance models that result in reduced emissions and other valuable outcomes such as job creation and improved air quality. These solutions are also tailored to specific city attributes including the electricity grid’s health, local population density and income level.
“Decarbonization solutions already exist – we don’t need to wait for the next big innovation. This platform provides examples of policies and business models that have been used successfully around the world. We are starting with 200 solutions and expect to have many more over the course of the next year,” said Kristen Panerali, Head of Energy, Materials and Infrastructure Programme, Net-Zero Carbon Cities, World Economic Forum.
“Urban ecosystems are pivotal in our global journey to net zero, driven by clean and smart electrification. These sustainability initiatives can help accelerate efforts to address climate change with practical and integrated energy solutions for urban transformation for cities of any size around the world,” said Jean-Marc Ollagnier, Chief Executive Officer, Europe, Accenture.
Achieving net-zero emissions at city scale will require a transformation in how energy is produced, distributed, and consumed. A related report shows how the built environment and mobility can serve as a catalyst for urban transformation and decarbonization anywhere in the world.
The Toolbox of Solutions is part of the Forum’s Net-Zero Carbon Cities programme, which brings together businesses with city, regional and national government leaders to accelerate urban transitions to a net-zero future. The programme’s objective is to align and scale efforts across businesses, cities and national-level governments to deliver urban ecosystems that are sustainable, resilient and equitable. The programme aims to enable transformation towards clean electrification and circularity, using integrated energy solutions to address energy, buildings and mobility. The Net-Zero Carbon Cities programme is co-chaired by Jean-Pascal Tricoire, Chairman and Chief Executive Officer, Schneider Electric, and Francesco Starace, Chief Executive Officer, Enel.
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