Citiscope was at the World Urban Forum in Medellín, Colombia. We blogged at citiscope.org/Medellin and tweeted with the hashtag #WUFideas to share ideas we heard about that cities around the world could learn from. Please join the conversation!

Bangalore, India is finding a path out of an urban trash crisis by bringing dignity to workers who once were ostracized.
By Sumit Chakraberty / April 14, 2014
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A look inside the recycling center run by a waste-picker in Bangalore.
By Sumit Chakraberty / April 16, 2014
New approaches to trash problems in India’s IT center are making an impact, but slowly.
By Sumit Chakraberty / April 15, 2014
Medellín's population exploded after 1950. The city has been playing catch-up with all that growth ever since.
By Christopher Swope / April 7, 2014
Strong mayors, bold projects and a relentless focus on inequality haven't solved all of Medellín's problems, but have put the city on the right path.
By Christopher Swope / April 11, 2014
Decentralization of power in Colombia in the 1980s and '90s gave transformative mayors who came later more power to govern.
By Christopher Swope / April 9, 2014
You've probably heard of the drug lord Pablo Escobar. Medellín would rather you know Mariela Espinosa Arango, who stood up to him.
By Christopher Swope / April 8, 2014
Senegal's capital is using a "high intensity manpower" approach to upgrade its streets and put people to work.
By Tidiane Kassé and Aminatou Diop / March 31, 2014
Only 300,000 customers in this city of 20 million pay their water bills. The city's water board hopes opening a new line of communication with customers could help with collections.
By Mahim Maher / March 25, 2014
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Japan’s capital has slashed greenhouse gas emissions from office buildings using the world's first city-level carbon-trading system. It's worked — but not for reasons that have much to do with emissions trading.
By Maya Kaneko / March 10, 2014
Avenida 9 de Julio used to have 20 lanes of traffic. A new bus rapid transit system now occupies four of those lanes — and signals a new way of thinking about urban mobility in the Argentine capital.
By Marcela Valente / March 3, 2014
Walter Hook, CEO of the Institute for Transportation & Development Policy, tells Citiscope where the BRT movement has been and where it's going.
By Christopher Swope / March 5, 2014
New bus rapid transit lanes are just one part of the new thinking about urban mobility in Buenos Aires.
By Christopher Swope / March 4, 2014
Air pollution from the brick kilns near Bangladesh’s capital kills almost as many people each year as the infamous 2013 textile mill collapse. The brick makers are starting to clean up their act.
By AZM Anas / February 26, 2014
Vancouver used an innovative public-private partnership to build the Canada Line light rail for the 2010 Olympics. Now, rail projects in Edmonton, Denver and Maryland suburbs of Washington, D.C. view Vancouver as a model.
By Frances Bula / February 17, 2014
Despite the success of Vancouver's Canada Line, the next extension of the city's SkyTrain system is using a different public-private partnership strategy.
By Frances Bula / February 20, 2014
Canada has joined Europe and Australia as a leader in using "P3s" for all manner of infrastructure projects. In an interview with Citiscope, PPP Canada CEO John McBride explains how it works.
By Christopher Swope / February 19, 2014
In downtown Vancouver and the suburb of Richmond, development is booming around the Canada Line's rail stations.
By Frances Bula / February 18, 2014
Ghana is on a national quest to name all of its city streets. It's an exercise that rapidly urbanizing cities across the developing world can learn from.
By Anny Osabutey / February 10, 2014
In fast-growing cities of the developing world, naming streets is just one step in improving city services. The World Bank’s Catherine Farvacque-Vitkovic explains.
By Christopher Swope / February 11, 2014
Albay Province is vulnerable to volcanic eruptions, typhoons, mudslides, earthquakes and tsunamis. Preparing for all of them has become a way of life.
By Imelda Visaya Abano / February 3, 2014
Living with natural hazards is nothing new in this city in the Philippines, but the people are finding ways to make it safer.
By Imelda Visaya Abano / February 5, 2014
The Philippines' champion of climate-change adaptation talked with Citiscope about what it will take to make cities resilient against natural disasters.
By Imelda Visaya Abano / February 4, 2014
A year ago this month, Estonia's capital became the world's largest city to offer free transit for all its residents. The policy has improved access to the city, but shown little impact on traffic.
By Sulev Vedler / January 27, 2014
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In the United States, free transit often comes in the form of buses serving college campuses. One of the oldest such fare-free systems dates to the early 1970s.
By David Hatch / January 29, 2014
In an interview with Citiscope, transportation researcher Oded Cats discusses findings from his study of Tallinn's free public transit policy.
By Christopher Swope / January 28, 2014
Here's how Aguascalientes turned a scrubby strip of pipeline land into a 12-km linear park that cuts through 90 neighborhoods.
By Ana Arana / January 20, 2014
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On assignment for Citiscope, an investigative journalist finds a different side of Mexico in Aguascalientes.
By Ana Arana / January 23, 2014
In this city in Mexico, people play on green lawns, take dance classes and play sports in a strip of land that used to be dusty and dangerous.
By Christopher Swope / January 22, 2014
In an interview, the visionary behind an extraordinary urban park in Mexico tells Citiscope how she did it.
By Ana Arana / January 21, 2014
Nine English cities said no to having an elected mayor. Bristol voters said yes. The man they picked for the job wants Bristol to be a model medium-sized city for Britain and all the world.
By Eugene Byrne / January 13, 2014
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Outside of London, not many cities in the UK have opted to have an elected mayor with executive powers. Local government expert Robin Hambleton says they’re missing out.
By Christopher Swope / January 17, 2014
The idea of establishing a local currency isn't necessarily new. But Bristol is taking it to new levels.
By Eugene Byrne / January 16, 2014
On certain Sundays last year, you were more likely to find a couch in the middle of a Bristol street than an automobile.
By Christopher Swope / January 15, 2014
In an interview with Citiscope, Bristol's first elected mayor discusses the ideas that will shape the future of his city.
By Eugene Byrne / January 14, 2014
Berlin’s “Neighborhood Mothers” program opens doors and reaches out to immigrants and suggests a global model.
By Birgit Heitfeld / October 15, 2013