Cities are constantly evolving and must move towards increasingly sustainable objectives. Pollution, air quality, public health and the city model are aspects that require profound transformations. It is essential to develop an urban model that is respectful of the environment, optimising the use of the territory and guaranteeing all services for the inhabitants.
Sustainable cities: What does it mean?
Being sustainable means approaching the development of cities in a multifaceted way. A sustainable city not only reduces pollution, but also improves the quality of life of its inhabitants. To achieve this, it is vital to integrate economic, social and environmental approaches. For example, cities must ensure economic well-being with decent jobs, equitable access to health services, education and transport. At the same time, they must protect biodiversity and improve air and water quality.
The UN, through the 2030 Agenda, establishes that cities must be inclusive, safe, resilient and sustainable. This holistic approach includes the development of green infrastructure, the promotion of recycling and waste reduction through the circular economy, and the efficient management of natural resources.
The challenges of urban growth
Today, almost half of the world's population lives in urban areas. This percentage will continue to increase, with projections that by 2050, more than 70% of the world's population will live in cities. In many countries, such as Spain, this percentage already exceeds 80%.
The growth of the urban population brings with it new challenges. These include sustainable mobility, the reduction of polluting gases and the intelligent management of waste and water. The cities of the future will have to grow upwards, in ecological skyscrapers that house both homes and offices and green spaces.
On the other hand, traffic is one of the biggest problems, causing pollution and affecting air quality. That is why the development of alternative means of transport such as the use of electric bicycles, car sharing and efficient public transport is crucial.
Keys to a sustainable city of the future
Investing in renewable energy in the energy system is one of the fundamental keys for the cities of the future. Some cities are already leading this transition towards carbon-free energy models. A paradigmatic case is Tokyo (Japan), which invests in renewable technologies for self-sufficiency in the event of disasters.
Copenhagen, meanwhile, has achieved a 62% increase in the number of its inhabitants using bicycles to travel to work or school. Investment in sustainable infrastructure, such as bridges and cycle paths, has been decisive in reducing the city's carbon emissions.
Another key is the implementation of sponge cities. This concept consists of creating infrastructures that absorb and manage rainwater, reducing flood risks and using the water to irrigate green areas. In this way, cities also contribute to the regeneration of ecosystems in their surroundings.
Mobility and sustainable transport
Mobility is another key issue for the future of cities. Given the problem of car congestion and the emissions they generate, policies are needed to promote efficient and environmentally friendly public transport.
In cities such as Curitiba (Brazil), public transport systems such as Bus Rapid Transit (BRT) have been implemented, with buses running on dedicated lanes and prioritising efficiency in journeys. These innovations not only improve air quality, but also reduce dependence on private cars.
Responsible building and urban resilience
Buildings in the cities of the future will need to be constructed from sustainable materials and, wherever possible, integrate smart technologies that monitor energy use and optimise resource consumption. Cities such as Singapore are already pioneers in this type of architecture, with vertical gardens and buildings that use solar and geothermal energy.
Furthermore, urban planning that responds effectively to natural disasters such as floods or earthquakes is key. Tokyo, as we have already mentioned, has implemented seismic isolation technologies and urban policies to reduce the effects of potential catastrophes. Urban resilience will allow cities of the future to adapt in real time to extreme natural phenomena.
The importance of the circular economy
The circular economy offers an alternative to the traditional model of production. Instead of making, using and throwing away, the circular economy seeks to reuse, recycle and minimize waste. Cities like San Francisco are leaders in these policies, aiming for a zero-waste future.
To implement this circular economy system in cities, it is vital to educate the population and encourage the active participation of citizens in the process of recycling and reusing materials.
Green spaces also play a fundamental role in maintaining urban biodiversity. These parks and gardens not only improve air quality, but also offer a place for meeting and recreation, improving the quality of life of the inhabitants.
Cities of the future must not only be environmentally sustainable, but also inclusive and resilient, ensuring that all citizens have access to a prosperous and healthy life in a safe and clean environment.