Fresh Air

Pulitzer Prize-winning journalist Katherine Boo spent more than three years in Mumbai's Annawadi slum to do research for her new book, Behind the Beautiful Forevers. Residents of the slum — which is located next to the Mumbai airport and in the shadow of several luxury hotels — live in devastating poverty.

Brooklyn drummer Matt Wilson keeps busy with many bands and projects — other people's and his own. Two new Wilson albums find him as part of a co-op all-star trio, and at the helm of one of his own quartets. Part of Wilson's appeal is that he keeps things light, in a good way.

Rick Hall and Billy Sherrill were a couple of Alabama boys in their teens when they started writing songs. At first, the only place they had to record was in a room in the back of the Trailways bus station in Florence, Ala. But one of the songs they recorded there, "Sweet and Innocent," became a small local hit, and a guy named Tom Stafford read about it in the local paper. He built a recording studio above City Drugs in Florence and went into business with the two young men. It didn't last long: Sherrill was hugely ambitious and was soon off to Nashville.

Fresh Air Weekend highlights some of the best interviews and reviews from past weeks, and new program elements specially paced for weekends. Our weekend show emphasizes interviews with writers, filmmakers, actors, and musicians, and often includes excerpts from live in-studio concerts. This week:

Three years ago, venture capitalists were pouring billions of dollars into technologies like solar power, wind power, biofuels and fuel cells. The federal government followed, directing some $44.5 billion into clean technology from late 2009 to late 2011 through loans, subsidies and tax incentives.

But now the clean-tech industry is facing leaner times, in part because of cheaper natural gas prices, the effects of the financial crisis and China's growing solar industry.