Bill Frist, a surgeon who also served as Senate majority leader, has emerged as an outspoken advocate for environmental health. “A healthier planet means healthier people,” he said.

© Kirsten Luce for The New York Times

The long-running series in which readers answer other readers’ questions considers a hot topic within renewable energy

This week’s replies: Are there places on Earth where humans haven’t been?

I would like to know why we build solar farms over green space, when we could just put them over massive car parks as a popular current internet meme suggests. Chris, Middlesbrough

Post your answers (and new questions) below or send them to nq@theguardian.com. A selection will be published next Sunday.

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© Photograph: Justin Paget/Getty Images

© Photograph: Justin Paget/Getty Images

© Photograph: Justin Paget/Getty Images