DING!

That's the sound of a really good idea popping into my head. Ding!
If people want to save energy and "Think Green" (I still kick myself for not having the knowledge about such things at 10 years of age to copyright that saying!!!), then I have an idea you may want to try.
Stop wearing underwear!
Ya! You stop wearing underwear, you could possibly save thousands of cotton plants a year, the energy it takes to create those cotton plants into cotton pants, not to mention the energy it takes to wash these underwear every week. Your laundry will go down, therefore saving water!
Now isn't that thinking green, everybody?