Plant a Tree for Free
Use my referral code for One Tree Planted, and you can plant a tree for free without needing to pay for more of them (though of course, you totally can if you want to! They normally cost $1 per tree to plant). The way it works is you click the link and it will give you a page with a code on it. Copy this code, choose a program where you want to plant a tree, and put it in your cart. At checkout, you put the code in the space for codes and it will subtract the dollar to make it free.
I did once earn a t-shirt for referring people, but I think that doesn't happen twice, and was because friends bought extra trees as a birthday present for me - I just want to be clear since it's a referral situation and you might wonder. I just want more trees planted! :)
I'll give you the link to the referral code when you propose a deal.
Training & Qualifications
I am a tree-hugging Druid. :)