There's no greater threat to humanity than climate change. What can we do to stop the worst consequences? This hour, TED speakers explore how we can save our planet and whether we can do it in time. Guests include climate activist Greta Thunberg, chemical engineer Jennifer Wilcox, research scientist Sean Davis, food innovator Bruce Friedrich, and psychologist Per Espen Stoknes.

Failure can feel lonely and final. But can we learn from failure, even reframe it, to feel more like a temporary setback? This hour, TED speakers on changing a crushing defeat into a stepping stone. Guests include entrepreneur Leticia Gasca, psychology professor Alison Ledgerwood, astronomer Phil Plait, former professional athlete Charly Haversat, and UPS training manager Jon Bowers.

Our greatest breakthroughs and triumphs have one thing in common: creativity. But how do you ignite it? And how do you rekindle it? This hour, TED speakers explore ideas on jumpstarting creativity. Guests include economist Tim Harford, producer Helen Marriage, artificial intelligence researcher Steve Engels, and behavioral scientist Marily Oppezzo.

John Foley started climbing the rungs of the corporate ladder at a young age, first as a fast food server and eventually as an e-commerce executive. Still, at 40, he couldn't climb out of bed fast enough to make it to his favorite spin class. John couldn't understand why there wasn't a way to bring the intensity and motivation of a boutique fitness class into the home. Having never worked in the exercise industry, he teamed up with a few friends to create a high-tech stationary bicycle called the Peloton Bike. Today, Peloton has sold close to half a million bikes, with a valuation as high as 4 billion dollars. Recorded live in New York City.

At age 22, Whitney Wolfe helped launch Tinder, one of the world's most popular dating apps. But a few years later, she left Tinder and filed a lawsuit against the company alleging sexual harassment. The ensuing attention from the media – and cyberbullying from strangers – prompted her to launch Bumble, a dating app where women make the first move. Today, the Bumble app has been downloaded close to 30 million times. PLUS in our postscript "How You Built That," we check back with Michael Dixon, whose business Mobile Vinyl Recorders uses portable record lathes to cut vinyl at parties, weddings, and music festivals. (Original broadcast date: October 16, 2017)

In 1970, George Zimmer was a college graduate with no real job prospects and little direction. That's when his father, an executive at a boy's clothing company, asked him to go on an important business trip to Asia. It was that trip that propelled him into the world of men's apparel. In 1973, the first Men's Wearhouse opened in Houston with little fanfare. But by the mid-80s, George Zimmer managed to carve out a distinct niche in the market – a place where men could buy a good quality suit, at "everyday low prices," along with all the shirts, ties, socks, and shoes they need. With George as the face of the brand, Men's Wearhouse became a multi-billion dollar empire with hundreds of stores across the U.S. But then, in 2013, a bitter battle forced him to give it all up. PLUS in our postscript "How You Built That," we check back with two brothers from Guinea, West Africa who founded a company that makes Ginjan, a spicy-sweet juice from their childhood that mixes pineapple and ginger.