Our Freakonomics Radio project includes a regular podcast and Marketplace segment. But twice a year, we also produce a set of five one-hour specials that play on public-radio stations across the country. Find a station near you.
Season 2, Episode 2

(Photo by Nick Laham/Getty Images)
Is booing an act of verbal vandalism? Or the last true expression of democracy?
In this hour-long special, hear how Philadelphia sports fans earned their reputation as the loudest boo-birds, and whether the distinction of high or low culture plays a role. You’ll hear from former Pennsylvania Governor Ed Rendell, who admits to booing Santa Claus; and sportswriter/opera buff Robert Lipsyte, who was surprised that more people didn’t boo Pavarotti when he “parked and barked” his way through a performance.
Also in this episode, we look at “conspicuous conservation” – when people go out of their way to engage in “green” activities. While driving a Toyota Prius may do a little bit of good for the planet, being seen driving a Prius may do a lot of good for you. And one more mystery: why some people install solar panels on the shady side of the street.

Greatly enjoyed your piece about the lost act of booing at public events. Thoughtful choice of interview subjects, too. Will recommend this piece, via podcast, to others.
So how much energy were those PVs on the roof of the BBC actually producing?