From the artistic to the realistic to the high-concept futuristic, here are four cool earth-friendly undie ideas.

Charge with your chest.
When exposed to the sun, the solar-power bra created by Triumph International in Japan (pictured) generates electricity. When our iPhone is dying, we know we'd readily take off our shirts.

Use the bounce for good.
Slate's Adrienne So has bemoaned the uncomfortable jiggle that keeps some busty women from working out. Her eco-exercise underwear solutions? She proposes a bra that harnesses the power of the bounce and re-uses the energy.

Practice safe fashion.
Spermicide in your seams anyone? Artists and designers have created everything from bikini tops to ball gowns with the handy prophalactic, reminding us that wearing condoms really is cool (if not the most practical for a day at work).

Think orgasmic, shop organic.
Your lingerie can be green (without the solar panels) -- GreenKnickers.org has all-organic, free-trade thunderpants.

While the gyration powered light bulb is still in the works, there are plenty of other ways to be sexy and sustainable in your skivvies. Click here for more tips on how to get green while you're getting it on.

* Turn of the lights and light some candles to reduce your annual carbon footprint by up to 20 tons.

* For super-soft sheets that are good to the earth, buy bamboo fiber, which comes from a renewable resource and is grown without pesticides.

* And don't think your adult films can't be environmentally aware as well. Sites like Vegporn.com feature your usual porny plot lines and images, starring vegetarians and vegans.

For more ideas on how to turn your love life green, see our feature on loving yourself while loving the environment, or click here for the Greenpeace guide to Eco-Sex.

Tell us! What is your favorite way to save the environment from your bed?