He said he had asked Meridian head Neal Barclay for advice about it.
"I said to him: 'I want a book that I can understand, that actually points to what I can do today, not some sort of nebula scientific concept'."
The practice of keeping a Bible in hotel rooms started in the late 19th century when three men who founded Gideons International in the 1800s spread the good news by distributing Bibles in hotel rooms.
Stephens received the climate change book - Drawdown - the next day.
"It's a great book because it's got lots of pictures.
"And you can read it on an aeroplane and you can read it for 10 minutes before going to bed.
"So it struck me that having books like that in our hotel rooms - for somebody who just wants to pick up on it relatively light, but reinforcing the message, that'll be the new Gideons Bible in SkyCity rooms in the next month or two.
"And we'll look to update to it...and we don't mind if a few get stolen. It's for a good cause.''