Michael Bloomberg speaks at the U.S. Conference of Mayors.

Bloomberg's $200 Million Challenge to Cities

The latest rendition of the competition asks cities to come up with innovations that can move the entire nation forward.

Vienna Makes Peace With Its Trash

The famously clean Austrian city boasts one of the world’s most innovative waste processing systems.

A new PNAS study questions research behind 100-percent renewable energy commitments led by Mark Jacobson.

The Heated Politics of Renewable Energy

As cities vow to meet the Paris climate commitments, rival researchers debate the true costs of going 100-percent renewable.

Can Detroiters Finally Get a Stake in the City's Real-Estate Boom?

A new program gives locals the skills to launch businesses and dictate how their city is expanding.

A sign in front of sunflowers with a busy intersection in the background

Creating a Better Community Through Text Messages

As cities make their data more transparent and accountable, this project in New York found one way to use technology to engage the residents in the planning process—by prompting locals to text in ideas.

A shopper peruses the offerings at the Food Bank For New York City Community Kitchen & Food Pantry of West Harlem.

Why Can't America Solve the Hunger Problem?

The new book Big Hunger: The Unholy Alliance Between Corporate America and Anti-Hunger Groups argues that food banks and pantries don’t chip away at underlying issues that keep people food-insecure.

Akron's Innerbelt Highway divided the city for decades. Now a pop-up park promises reconnection.

In Shrinking Akron, a Dead Highway Becomes a Forest

The six-lane Innerbelt connector obliterated downtown Akron in the 1970s. Next summer, it’s going to be covered in trees.

Australia's Tantalizing Lessons on Privatizing Infrastructure

The White House is interested in modeling Australia’s approach to national infrastructure. Here’s how they do it Down Under.

A woman combs her mother's hair outside their home in a Kolkata slum.

Rethinking India's Slum Resettlement Policy

A recent study makes a case for the government to engage with slums, rather than relocating inhabitants to cities’ outskirts.

Wedding-cake toppers of same-sex couples

The Challenges Stacked Against Aging LGBT Americans

A lifetime of discrimination puts this generation at higher risk for social isolation, health problems, and economic insecurity. What can be done?  

Suburban sprawl and private car use will have to contract to meet local climate goals.

5 Ways U.S. Cities Can Fight Climate Change Without the Paris Accord

Build dense. Build near transit. Rinse and repeat.

Barcelona's Old Town Gets A Reboot

The city seeks to control the excesses of tourism without making its oldest quarters feel like an empty shell.

A police officer's shadow cast on a wet street

Pulling Back the Curtain on Police Officers' Suicides

Local efforts and federal laws are softening the macho culture and opening up new avenues for cops to ask for help.

How Some Kids Escape Poverty

Just 16 percent of children who grow up in poverty manage to become economically successful adults. How do they do it?

Built-Out Barcelona Makes Space for an Urban Forest

The city is planning a major green makeover to combat the heat island and create a more welcoming place for humans and animals alike.

The 100-Year-Old Penalty for Being Black

Inherited racial disadvantage, more than poverty, explains why generations of African Americans have not reached economic parity with whites.

Small sensors atop a fleet of garbage trucks in a garage in Cambridge, Massachusetts

Cambridge's Fleet of Smart Garbage Trucks Is Here to Sniff Out Problems

A collaboration between the city and MIT’s Senseable City Lab, these sensor-equipped vehicles can detect gas leaks, potholes, and other urban hurdles across their paths.

New York City's pedestrian safety improvement projects have reduced fatalities.

New York City Seeks the 'Holy Grail' of Street Design

Why do some intersections have such high pedestrian injury rates? It’s not all about the number of cars.

Danny McFadden, of Phoenix, a driver for AZ Iceman, loads up a pallet of bagged ice as temperatures were predicted to hit 115 during a heat wave in July 2007.

How Phoenix Helped Its Working Poor Beat the Summer Heat

The city organized a massive outreach campaign when it learned that low-income communities didn’t know about its free cooling stations.

Adelphi University's Meghan McPherson stands with Katrina Zhan at Polish Couture Nail Salon in North Hempstead, NY.

Disaster Prep, at the Nail Salon

A Long Island university’s efforts to reach Mandarin-speaking workers hit on the value of social resilience.