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Urban Development

Cooler buildings and lower bills in summer thanks to green walls and roofs

MD Staff

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A 15% cut in the energy bill with a 40% reduction of the direct solar radiation in dwellings and a lower indoor temperature by up to 3 degrees thanks to plants grown on roofs, balconies and external walls. These are part of the outcomes of the Italian pilot project ENEA is conducting at its research center near Rome.

“We developed a green wall based on an extensive roof-garden system and a self-supporting structure positioned at 50cm from the wall of the School of Energies building, where we conduct training courses”, Carlo Alberto Campiotti at the Department Unit for Energy Efficiency, said. “Successively – Campiotti went on – we’ve begun to study the interactions among green coverings, energy flows, the microclimate and indoor comfort, diversifying the species”.

The “plant system” installed on walls, roofs and balconies, has proved capable of creating an actual insulating pad enveloping houses and condos; in this way vegetation can mitigate temperature peaks during summer, capturing most of solar energy, which doesn’t directly hit the building surface, dissipating through evapotranspiration of plants a large amount of thermal energy (up to 1 liter of water daily per square meter) which would otherwise be absorbed by the building and released as heat inside the house.

“In summer this vegetation system allows to reduce up to 15% of energy for cooling- Campiotti pointed out- while in winter savings for heating reach 10% thanks to the chimney effect between the wall and the vegetable blanket; in practice, a natural ventilation system removing moisture from walls and reducing the thermal dispersion of the building”. Each plant has its own type of leaf given by color, thickness, shape, arrangement on the stems and biological cycle, which determines the amount of solar radiation it captures instead of hitting the walls of the building.

The parameter defining the energy and bio-agronomic traits of plants is called green factor (kv) and it varies from a minum of 0 to a maximum of 1. In practice, if kv is 1, it means the green mantle doesn’t exert any shielding towards solar radiation and, in summer conditions, the temperature of the external wall is superior to both that of the air and that inside the building; but if the value is zero, it means that vegetation exerts a total shield and the temperature of the wall is equal to that of the air.

“The Pandorea Jasminoides variegata – Germina Giagnacovo at the Energy Efficiency and Productive Activities Department explained – is a climbing evergreen with an excellent ability of neutralizing solar radiation, as Lonicera hall prolific and Partenocissus quinquefolia do, although slightly less effectively”.

“In addition to an improved thermal and acoustic insulation and living comfort for individual dwellings, these solutions also have advantages for the entire urban context: green roofs and walls, in fact, contribute considerably to the reduction of the “heat island”, which can cause a peak of the electrical load during summer, between 3 and 8% for each additional degree of temperature.

Furthermore, less use of air conditioning means less greenhouse gas emissions such as CO2, methane, fluorinated gas and water vapor. Installing green roofs, balconies and walls also means mitigating the effects of the so called “rain bombs” – roofs and balconies account in fact for 20% of the total surface of cities and covering them with plants would allow to absorb up to 50% of rainwater, regulating its flow into the city’s water system- in addition to improving air quality, since 25 m2 of plant surface generate oxygen for one person, while 1m2 eliminates 0.2 kg of particulate matter in the air.

“For many sectors in distress in our economy, including the building sector, new prospects for recovering are opening up- Campiotti continued- also thanks to the introduction of the green bonus with the last Budget Law, a new fiscal incentive which allows to recover 36% of the costs, up to 5thousand euro incurred for re-greening single dwellings and parts of condos, an intervention which could increase the value of the building itself”.

Green coverings

“Extensive, mildly intensive and intensive are the three types of green coverings we’re experimenting with at ENEA- Susanna Mariani at the Department Unit for Energy Efficiency, explained. We are particularly interested in the experimental use of autochthonous varieties, such as climbers and evergreens, but also rare wild species such as Echium vulgare, also known as viperina grass, much loved by bees, which can guarantee maximum protection of biodiversity, adaptability to climatic variability and resistance to summer droughts “.

In detail, the extensive coverings are characterized by varieties of plants that are easy to grow (of the genus ‘sedum’, a set of various species of succulents, and perennials) that need little maintenance and rescue irrigation (mosquito-proof), since they can store a large amount of water. This type of roofing is particularly suitable for walls and slopes, since the installation reaches a weight of about 100 kg / m2. Intensive coverings, on the other hand, foresees the inclusion of trees, require high maintenance and increased irrigation, involving the installation of a weight on the building ranging from 400 to 1000 kg / m2, while the mild intensive is positioned halfway between the other two varieties of coverings, by type of plants and maintenance, weighing between 200 and 400 kg / m2

The courses

In september, at the School of Energies of the ENEA Casaccia Research center, the Energy Efficiency Department will organize a course on the cultivation of plants best suited for green coverings. The course is free of charge and is addressed to agronomists, land surveyors, architects, biologists and natural sciences graduates.

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Urban Development

Cities rally against hate, discrimination, racism and violent extremism

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Local governments are and should continue to be key global actors and “co-shapers of a global framework for action” to address current worldwide challenges related to social transformations, together with national governments, international and regional institutions, and civil society. In this context, the Global Steering Committee of the International Coalition of Inclusive and Sustainable Cities – ICCAR adopted the “Nancy Declaration” at its meeting in Nancy (France), on 10 December 2018, in parallel with the City’s celebration of the 70th anniversary of the Universal Declaration of Human Rights.

Led by Mayor Laurent Hénart of Nancy, Mayor Erias Lukwago of Kampala (Uganda) and Benedetto Zacchiroli (President of the European Coalition of Cities against Racism –  ECCAR), mayors and other local officials representing regional and national coalitions charted and adopted this new roadmap for action for ICCAR member cities. The Nancy Declaration calls for renewed commitment to “develop effective responses to the rise of hate, bigotry and violent extremism, growing worldwide phenomena that accentuate racism, intolerance and discrimination, by implementing local and collective advocacy efforts to raise awareness, developing guidelines and tools in response to these threats, and conducting capacity-building and education-related initiatives”.

Ângela Melo, Director of Policies and Programmes of UNESCO’s Social and Human Sciences Programme, affirmed in her opening remarks that there is an urgent need to rethink the role of cities, to provide them with the means to promote inclusion and respect for diversity, and to ensure that they become green, inclusive and smart. A human rights-based approach should be the foundation of preventing and fighting discrimination through promoting inclusion and diversity framed on the 2030 international agenda of the sustainable development goals.  

Held at the same time as the Intergovernmental Conference on the Global Compact for Migration (Morocco, 10-11 December 2018), the ICCAR meeting, organized by UNESCO and the City of Nancy, with the support of ECCAR, served as the “common voice” of its member cities. It concurred to “take action in line with the UN Global Compacts on migration and refugees to eliminate prejudice by highlighting the positive and multiple contributions of these groups to all spheres of life in receiving, transition and origin countries.”

The International Coalition of Inclusive and Sustainable Cities – ICCAR was launched by UNESCO in 2004. Represented by seven regional and national coalitions, ICCAR is a 500-plus member network of cities across continents. They advocate for global solidarity and collaboration to promote inclusive urban development free from all forms of discrimination. Over the years, the recognition of ICCAR has increased as a global reference for city-to-city cooperation in the pursuit of inclusion and diversity in the urban space.

UNESCO

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Urban Development

How South-South and Triangular cooperation can promote green growth and sustainable cities

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As part of the Global South-South Development Expo 2018, the United Nations Industrial Development Organization (UNIDO) convened a thematic solution forum on sustainable urban-industrial development along the Belt and Road.

The forum, building on the outcomes of UNIDO’s flagship BRIDGE for Cities event, focused on how green growth and sustainable cities can be promoted through South-South and Triangular cooperation. It was attended by a high-level audience consisting of representatives from Member States, UN agencies, development finance institutions and the private sector, as well as from civil society and academia.

The moderator of the forum, GONG Weixi, who is Senior Coordinator for South-South and Triangular Industrial Cooperation at UNIDO, introduced the theme by referring to the fact that more than 50 per cent of the world’s population currently lives in cities. He suggested that dealing with urban issues will have a direct impact on poverty reduction and on ensuring quality of life around the world.

The panellists, who included Carlo Fortuna from the Central European Initiative; Sabine Ohler, Director of International Business at the Vienna Business Agency;  Rohey Malick Lowe, Major of Banjul, Gambia; and Mohammad Mustafizur Rahman from Bangladesh’s  Ministry of Information Communications Technologies Division; remarked that while the GSSD Expo makes an extremely valuable contribution to linkage and learning, it is up to developing countries themselves to leverage the success stories and lessons learnt, and that they should take ownership of their development strategies.

There was also agreement that while foreign investments and technology transfer are essential in the development process, South-South cooperation is a process that cannot be forced. It should deliver mutual benefits for all parties, while respecting their national sovereignty.

Gong said, “As the key take-away for this session, the ‘catch-up’ strategy for developing countries to develop through their own efforts is ‘3L’ – linkage, learning, and leverage. The forum today provides us with a platform to link with and learn from all development stakeholders. Ultimately, it is the engagement and ownership of developing countries themselves that can ensure development results.”

The Global South-South Development Expo is the only Expo offered by the United Nations system solely for the Global South. It provides a platform for all development actors and stakeholders to showcase Southern development solutions, celebrate South-South and triangular cooperation successes, share knowledge and lessons learned, explore new avenues for collaboration, and initiate new partnership efforts.

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Urban Development

ADB Report Shares Best Practices in Chinese Cities to Combat Climate Change

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Cities in developing Asia and the Pacific are growing fast, but this surge in urbanization has led to increasing pollution and environmental concerns, threatening to impact the quality of people’s lives. Innovative climate solutions in the People’s Republic of China (PRC), however, are demonstrating that it is possible for cities to pursue growth in a low-carbon and climate-resilient manner, according to a new Asian Development Bank (ADB) report.

The report, 50 Climate Solutions from Cities in the People’s Republic of China: Best Practices from Cities Taking Action on Climate Change, highlights case studies where cities in the PRC have embraced means of ensuring more sustainable and climate-resilient growth. Some of these solutions include reducing energy consumption, improving waste management, promoting green spaces, as well as introducing clean-fuel vehicles and public transport.

“Climate change could severely impact developing Asia and the Pacific’s economic growth in the decades to come if no action is taken,” said ADB Deputy Director General for East Asia Ms. M. Teresa Kho at the launch of the report in Beijing. “Actions taken in many cities in the PRC show that it is certainly possible to start to turn the wheel around on climate change and its impacts. Other countries could well find useful lessons from the PRC’s experience.”

The city of Hohhot in Inner Mongolia Autonomous Region, for example, is taking advantage of the area’s abundant wind resources to use renewable energy sources for district heating. The project, supported by a $150 million ADB loan and a technical assistance grant, has helped the residents enjoy cleaner air, while reduce health hazards due to toxic air pollutants due to the city’s previous reliance on coal.

About 50 hectares of old landfills in the city of Wuhan in central PRC, meanwhile, have been transformed into gardens for residents to enjoy, lessening health risks and environmental hazards from the untreated sites.

Other climate action efforts mentioned in the report include a market-based emissions trading scheme in Shanghai, which has seen 100% compliance since its launch in 2013, and the rollout of electric taxis in the city of Taiyuan in Shanxi province, which will help reduce 222,000 tons of carbon emissions per year once the full fleet of traditional taxis is replaced.

The report, which includes details of projects supported by ADB and others, is part of ADB’s aim to support the PRC government’s efforts to address climate change and showcase its innovations in low-carbon city development. ADB is committing $80 billion from 2019 to 2030 to combat climate change in the Asia and Pacific region, while ensuring that at least 75% of its committed operations support climate change mitigation and adaptation.

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