textbook shopping
this book website has better prices than amazon (which means way better than sbs for example), free shipping, AND donates part of the proceeds to literacy funds like: books for Africa, worldfund, room to read, etc.
BETTERWORLD.COM
they work with carbonfund.org to purchase renewable energy credits and help reforestation that will offset the damage of carbon emissions through transportation and shipping.
you should probably buy all your books from here (its not any more expensive than other book websites, free shipping, AND it gives you something to feel good about (saving the world, for example)