awesome! i totally drink silk and my current container has a green cap -- i didn't know what one was supposed to do with them! guess you register it online? this is great. thanks for sharing!
i just did this. go to the website, register, and then you can upload the barcode number on any/all bottles of silk (with a green cap) that you have at home (although the limit is one entry per day). cool way to make a quick difference (for every cap entered, silk will sponsor 30 additional kw hours of green power).
Oooh, I just tried this, too (I was checking out Lola's profile and found the post!). I think it's great that WhiteWave Foods is really committed to the environment. Plus, it makes you stop and think about the energy costs of our food. I love Silk Soymilk and will definitely be entering in the next green caps I collect!