© Ahshea / Pexels (CC0)
Healthy Cities
One Planet Cities are cleaner, greener cities

Traffic is the single biggest contributor to outdoor air pollution. As much as three-quarters of traffic emissions come from short journeys in and around cities. We have the solution to this pollution problem. Shift citizens from car dependency to active transportation. The benefits are big.

Cities have the power, through changes and investment in mobility infrastructures, to calm traffic, clear the air, and generally improve city dwellers’ health and well-being. By:

  • Building bike paths and pedestrian safety improvements
  • creating dedicated bus lanes, a switch to battery-powered electric buses, and/or innovative new approaches to public transport
  • discouraging car use and creating car-free downtown core areas 

Planners encourage active transport rather than perpetual traffic jams!

As urban populations grow, land becomes ever more precious. Designing streets for people rather than vehicles is one of the ways cities can reduce sprawl, emissions, traffic, and pollution, leaving the way open for improved health, more access and interaction with nature, and clearer, cleaner air.

© Superworld / WWF

Read the report

Streets for people and nature = low-carbon cities that help people thrive. Learn more on how cities can make that happen, and how you can play your part, in our report 30 Minutes Can Change Your World!

Read the report
Watch the report video summary




Influencing human behavior is key to unlocking the mass mobilization of citizens. Without this, we will not reach the Paris Agreement’s critical limit of 1.5 °C global warming, nor meet the Post-2020 Global Biodiversity Framework. WWF has long worked to halve humanity’s ecological footprint and reduce consumption of natural resources and consequent production. To effectively deliver on these goals, we must mobilize citizens globally to adopt sustainable behaviors. Building on WWF’s Save Nature Please framework, this guide provides tools for local governments to encourage behavior change among citizens, exploring: (1) cities and behavior change, (2) behavior change interventions, and (3) behavior change tactics and case studies on energy, food and transportation.



Jennifer Lenhart, Phd

Global Lead, WWF Cities


Barbara Evaeus

Global Communications Manager, WWF Cities