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Cities are heating up the planet—how they can do more to fight climate change

Cities have a central role to play tackling climate change. They of the greenhouse gas emissions which are heating up the planet.

At the same time, cities are from global warming. Flood, fire and drought are affecting everything from the homes and businesses, through to impacts on and .

This is critical given 90% of live in urban areas. Globally, cities are home to more than .

Our identifies 16 priority actions to address climate change in the construction and management of cities.

Building smarter

Climate change must be a key consideration when designing, building and managing our cities. The emissions generated need to be minimized and eventually eliminated.

We must build in locations, and in ways, that reduce climate risks. But policies governing how our cities are designed and constructed don't achieve this.

A recent study of three identified only limited action on adaptation and mitigation. Other research has found few urban development policies include that meet international targets.

The will see more than one million houses built by 2029. These new homes must address the climate challenge.

16 areas for priority action

The priority areas in our were informed by interviews with more than working in urban planning, architecture, landscape architecture, urban design, sustainability, construction and property.

The actions they identified cover the entire of the built environment.

One of the first barriers to overcome is the among industry professionals to initiate or demand climate action. They perceive others, such as property owners or clients, to have more influence.

Climate change risks should be identified in the early stages of planning new developments, backed up by effective tools to make risk identification and action easier:

"There were areas that were identified as being flood-prone or risk-prone. But there was no strategy to deal with what happens to those areas," says an urban planner.

Once specific projects are being considered, it is important to prioritize early stage climate assessments, supported by policies which mandate climate action:

"Everyone has good intentions but without big formal legislation around it, everyone's just sort of making their way in the dark," says a construction industry professional.

In the design stage, steps to improve the climate knowledge and skills of the workforce are critical. The selection of low-impact products and materials will also help ensure design is more climate-responsive.

The highest number of hurdles to climate action were found to occur during the costing and approvals stage. Participants spoke of a highly competitive building industry. If climate change initiatives introduced at an earlier stage aren't required by law, they are likely to be cut. "Unless there's something in it for them in terms of return on investment, it's going to be hard to get them to do it, unless we make them," says an urban planner.

During the construction phase, product and material substitutions that have detrimental environmental impact should be eliminated. Innovation should be encouraged:

"If you want to push the envelope a little bit in terms of using recycled materials […] that's a bit of a barrier. To push innovation is difficult," says a landscape architect.

Post-construction

Once construction is complete and buildings and public spaces are being used, it is important to invest in a thorough evaluation process. Building users should be involved to ensure buildings are maintained for optimal climate outcomes: "[We] tried to achieve the six-star rating […] the client has to maintain it [the building] for a year, and that's when things start to fall off," says an architect.

When it comes to area upgrades or building renewals, advocating and is important. But the custom of demolishing and building anew, is hard to shift: The reuse of the existing building obviously generates significantly less waste and involves less material. "So design decisions and strategic decisions around using existing buildings is really important," says an urban designer.

Working together

This is a time of significant change in our urban areas.

We need to make sure climate action is embedded in every stage of decision-making. This may mean more efficient use, and reuse, of the . This will require an overhaul of policies regarding building retrofits, and a change in mindsets.

The priority actions to address climate change in cities can be implemented across a range of levels for:

• individual professionals— of their climate change skills, including opportunities provided by professional associations
• professional practices—review internal processes to ensure climate action is mainstreamed across projects, and in company decision making
• universities teaching built environment —embed climate change knowledge, skills, and competencies across the curriculum
• governments at all levels—review to mandate mitigation and adaption.

By addressing these actions, we can collectively work towards achieving our emission reduction targets and making sure our climate change risks.