I am an animal-loving, tree hugging, wedding planner. Weddings create a lot of "waste" and should I ever be lucky enough to have my own wedding, I will keep the environment in mind and use it as a an opportunity to remind/educate my friends & family.
When it comes to wedding favors, I typically prefer the donation route telling guests about the charity that received. Torch Illumination on etsy has created a soy candle where 10% of proceeds go towards environmental conservation and they look good doing it!
To order your custom, eco-friendly wedding favors please visit https://www.etsy.com/shop/Torchillumination?ref=seller_info