Some former contestants from the mega-show "American Idol" offer their green tips. (Gerri Miller)

Also on MNN: Ecollywood: 'American Idol' edition featuring Michael Johns and Kimberley Locke

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Kimberly Caldwell: Hey guys, this is Kimberly Caldwell.

Elliott Yamin: Hi, I'm Elliot Yamin.

Allison Iraheta: Hey, it's Allison Iraheta.

Anoop Desai: Hi, I'm Anoop Desai and you're watching the Mother Nature Network.

Allison Iraheta: Alright hey, what's up guys? It's Allison Iraheta and my green tip of the day is to recycle. And uh ... yeah!

Kimberly Caldwell: Hey guys, it's Kimberly Caldwell. My green tip to you is use single-ply toilet paper instead of double-ply. Save the trees, OK? You don't really need all that down there.

Elliott Yamin: Hey I'm Elliott Yamin and my green tip is — you better recycle your butt off.

Anoop Desai: Hey this is Anoop Desai. My green tip is always recycle. I've never thrown away a bottle or a can, and you shouldn't, either.

MNN homepage photo of Allison Iraheta: ZUMA Press

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