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Each week we will curate half-a-dozen articles that we have published on a range of topics relevant to the conversations occurring on this website. We hope these will get you thinking about the future and inform your discussions.

This week our focus is on Climate Change. Our articles explore: how cities can be part of the solution, how climate modeling works, what comes after the Paris agreement, the changes in policy-making required, how communities are taking up renewable power; and the vital role of city foodbowls in a changing climate.

John Watson

Cities & Policy Editor

The Conversation

Why cities are a rare good news story in climate change

John Rennie Short, University of Maryland, Baltimore County

The visit this week of 65 mayors to the Vatican to discuss climate change, among other things, reflects the central role of cities in debates that for too long only took place at the global and national level. By necessity and by their nature, cities are having more success than national or international governments in addressing climate change.

Cities house more than half the world’s population, consume 75% of its energy and emit 80% of all greenhouse gasses. But cities are not just sources of problems; they are innovative sites for policy solutions.

Indeed, while the story of climate change is often depicted as a depressing repetition of huge problems with time running out, the story of cities and climate change is more optimistic.

On the front lines

The high concentration of populations and investment puts cities at the very heart of climate change issues. In drier regions, such as the West and Southwest, summer heat waves and droughts can cause health problems and strain water supplies for agriculture. In regions such as the Northeast, cities are experiencing wetter winters with heavier snowfall.

Many of the world’s cities are close to the sea, and many of the most vulnerable ones are those in coastal locations. Cities in the developing world, in particular, are often more vulnerable to natural disasters but less able to spend billions of dollars to upgrade their infrastructure to better withstand flooding or similar measures. Cities such as Dhaka, Mumbai, Bangkok, Manila and Ho Chi Minh City are already in low-lying areas that now have the threat of increased flooding from extreme weather. The city of Jakarta in Indonesia is challenged by flooding that accompanies the yearly monsoons. But land subsidence from compaction from new skyscrapers, and increased groundwater extraction for a growing population, has caused the city to sink 10 times faster than the Java Sea is rising because of climate change.

There is an unevenness to those most at risk; the urban poor, infants and elderly are most vulnerable.

Quality of life

The brute facts of climate change vulnerability in cities are prompting a new and more pronounced urban environmental sensitivity. Cities are responding with both climate change mitigation and adaption. Mitigation focuses on reducing the concentrations of greenhouse gases by using alternative energy sources, encouraging greater energy efficiency and conservation, and through the promotion of carbon sinks by planting trees.

Curitiba in Brazil is the showcase for many successful policies, including the integration of green spaces within the city, a widely used public transportation system and reduction of waste.

Separately, cities are adapting to the effects of climate change. Chicago has developed policies anticipating a hotter and wetter climate by repaving its roads with permeable materials, planting more trees and offering tax incentive to encourage green office roofs.

Why are cities promoting this shift? There is a bottom-up movement from residents pushing for a better quality of urban life. Global climate change issues such as the shrinking ice sheets and the perilous state of polar bears are real, but these problems are distant, long-term and difficult for urban residents to solve.

But these residents have an immediate experience of poor air quality in their city and a greater ability to leverage local polices to effect change. Global issues that seem distant yet pressing create a sense of anxiety without a clear route to immediate political response, since solutions struck in international negotiations can take decades.

Indeed, the nation state can be both too big to deal with urban issues and too small to affect global affairs. National legislatures, such as the US Congress, whose debates are shaped more by big monied interests than the everyday needs of local citizens, can too often get locked in ideological disputes and policy paralysis.

By contrast, the city – and its government – is small enough to connect with citizens and tailor specific polices, while large enough to make a real difference. For that reason, cities are the ideal stage for developing policies and practices of sustainability compared with global and the national bodies.

There is also growing competition among cities. As the world globalizes, cities are assessed by international standards in the competition for investment, skilled people and creative industries. Cities need to respond to the demands of an increasingly mobile and ecologically aware capital and global talent pool. Cities are now ranked, compared and assessed by the greenness of their environment and their success in moving toward more sustainable policies.

Urban networks

Cities are nodes in a global network of flows of people, ideas and practices. While the world is often described as a map of separate national states, it can be also visualized as a global urban network. Cities are learning from each other and testing policies, with the more successful ones diffused, adopted and adapted around the global network.

By 2014, the US Conference of Mayors Climate Change Agreement included 1,054 mayors representing a total population of more than 88 million citizens.

The organization helps cities with policy formulation to accelerate energy efficiency and adapt infrastructure to meet international standards by discouraging sprawl and encouraging urban greening. Many US cities have initiated environmental legislation that exceeds US Environmental Protection Agency standards and even, in the absence of national leadership, meets international standards.

Meanwhile, the C40 Cities Climate Leadership Group is a group of the world’s largest cities committed to tackling climate change to reduce carbon emissions and to increase energy efficiency. Forty cities signed up in 2006, hence the name, but more than 75 cities are now committed to the project. Their combined population is over half a billion.

We have much to learn from people and communities at the margins of world cities. In the past 60 years, between one and two billion people have created self-built communities in cities all over the world.

They have quite literally made their urban environments. This is not to romanticize the problems in slums. But our present environmental predicament is in large part due to an unthinking reliance on technology, the higher-tech the better. The slums of the world provide an invaluable lesson in creating cities with limited resources. They are in fact a living experiment in doing more with less. There are many lessons we can learn for this 60-year experiment of informal urban living.

There is a lot of bad news concerning climate change as our planet gets hotter and more vulnerable to environmental risks. But the cities of the world are where adaption and mitigation policies are being tried and tested. They are also a source of new jobs as the urban green economy generates new alternatives to traditional occupations. The cities are the cause of many of our environmental problems, but also, as it turns out, the solution.

John Rennie Short, Professor, School of Public Policy, University of Maryland, Baltimore County

This article was originally published on The Conversation. Read the original article.

What implications does climate change have for the future of Melbourne? How do we improve our sustainability? What are the opportunities and priorities? Share your ideas now.