There are tons of speaker options for your computer. But they're usually cheap plastic jobbers, and never really environmentally friendly.
Now you can get computer speakers, made from a very renewable source - bamboo! Grows like a weed in many places. Do they sound good? Well, the specs are pretty dismal - 300 - 10,000Hz and just 2 watts per channel, through your computer's USB port.
For a mere $26.99/pair, you can decide if sound quality is worth sacrificing to save the world.[Bamboo Speakers]