Tim Urban knows that procrastination doesn't make sense, but he's never been able to shake his habit of waiting until the last minute to get things done. In this hilarious and insightful talk, Urban takes us on a journey through YouTube binges, Wikipedia rabbit holes and bouts of staring out the window -- and encourages us to think harder about ...

Dan Bell films urban decay.

There's something amazing growing in the city of Detroit: healthy, accessible, delicious, fresh food. In a spirited talk, fearless farmer Devita Davison explains how features of Detroit's decay actually make it an ideal spot for urban agriculture. Join Davison for a walk through neighborhoods in transformation as she shares stories of opportunit...

With Wait But Why, Tim Urban demonstrates that complex and long-form writing can stand out in an online wilderness choked with listicles and clickbait.

Enrique Peñalosa is the mayor of Bogotá, Colombia. He advocates for sustainability and mobility in the cities of the future.

Income inequality is the highest it's been in nearly a century. Wage declines are making home ownership more and more difficult, leading people to become renters. Housing advocate Yale Fox thinks this is a huge problem, since most renters have little power to change fluctuating market prices or the condition of their rentals. In this talk, Fox i...

Urban planner Ryan Gravel shares the story of how his hometown of Atlanta, Georgia, rallied to build a massive urban park that will transform an abandoned railroad track into 22 miles of public green space called the Atlanta BeltLine. The places we live aren't inevitable, he says -- and if we want something different, we need to speak up.

Hacking is about more than mischief-making or political subversion. As Catherine Bracy describes in this spirited talk, it can be just as much a force for good as it is for evil. She spins through some inspiring civically-minded projects in Honolulu, Oakland and Mexico City — and makes a compelling case that we all have what it takes to get invo...

Through his writing and his realized projects, Peter Calthorpe has spread the vision of New Urbanism, a framework for creating sustainable, human-scaled places.

As New York’s chief city planner under the Bloomberg administration, Amanda Burden led revitalization of some of the city's most familiar features -- from the High Line to the Brooklyn waterfront.

Bees have been rapidly and mysteriously disappearing from rural areas, with grave implications for agriculture. But bees seem to flourish in urban environments -- and cities need their help, too. Noah Wilson-Rich suggests that urban beekeeping might play a role in revitalizing both a city and a species.

TED Fellow and urban designer Mitchell Joachim presents his vision for sustainable, organic architecture: eco-friendly abodes grown from plants and -- wait for it -- meat.

Can public spaces both reclaim the past and embrace the future? Landscape architect Walter Hood has explored this question over the course of an iconic career, with projects ranging from Lafayette Square Park in San Francisco to the upcoming International African American Museum in Charleston, South Carolina. In this inspiring talk packed with i...

Traditional homes and living no more! Experience the different ways people exist in harmony with one another and their surroundings.

Erik Schlangen is a civil engineer and pioneer of experimental micromechanics, who focuses on making industrial materials more durable.

Great talks to watch when you should probably be doing something else.

TED Studies, created in collaboration with Wiley, are curated video collections — supplemented by rich educational materials — for students, educators and self-guided learners. In Ecofying Cities, speakers reveal ideas about sustainable development (and redevelopment) that aren't all about setting limits, going without or preparing for the worst...

Thomas Heatherwick is the founder of Heatherwick Studio, an architecture and design firm that, among other projects, designed the astonishing "Seed Cathedral" for the UK Pavilion at Shanghai Expo 2010.

City planners are already busy designing futures full of bike paths and LEED-certified buildings. But are they designing for our happiness? It's hard to define, and even harder to plan for, but urban planner Thomas Madrecki has a simple solution: Ask the public.

Master architects share their vision for buildings that inflate, float, twist and glitter, while artfully addressing the challenges faced by their residents, their cities and the planet.

Great TED Talks illuminate an idea. Sometimes, they do it while making you laugh. These talks will bring a smile to your face. Please note: Vigorous debate ensued among our staff about which talks to include. So we hope you’ll find something for every sense of humor.

Catherine Bracy is the director of community organizing at Code for America.

With more than half of the world population living in cities, one thing is undeniable: we are an urban species. Part game, part urban planning sketching tool, "Cities: Skylines" encourages people to use their creativity and self-expression to rethink the cities of tomorrow. Designer Karoliina Korppoo takes us on a tour through some extraordinary...

Architect Kate Orff sees the oyster as an agent of urban change. Bundled into beds and sunk into city rivers, oysters slurp up pollution and make legendarily dirty waters clean -- thus driving even more innovation in "oyster-tecture." Orff shares her vision for an urban landscape that links nature and humanity for mutual benefit.

Kate Orff asks us to rethink “landscape”—to use urban greenspaces and blue spaces in fresh ways to mediate between humankind and nature.

Which TED Talks did you watch and share most in 2016? These talks about being a better listener, parent, person ... and, um, spam email recipient.

There's a creeping sameness in many of our newest urban buildings and streetscapes, says architect Vishaan Chakrabarti. And this physical homogeneity -- the result of regulations, mass production, safety issues and cost considerations, among other factors -- has blanketed our planet in a social and psychological homogeneity, too. In this visiona...

The prevailing image of where refugees live is of temporary camps in isolated areas -- but in reality, nearly 60 percent of them worldwide end up in urban areas. TED Fellow Robert Hakiza takes us inside the lives of urban refugees -- and shows us how organizations like the one that he started can provide them with the skills they need to ultimat...

Here's a fact: Not a single American working full-time for minimum wage can afford to buy a one-bedroom home. For many, mobile homes offer a way to break into homeownership. But owning a mobile home is risky, because these communities are virtually invisible and have few rights. Sociologist Esther Sullivan lists the reasons why mobile homeowners...

Jeff Speck is a city planner and the author of "Walkable City."