I supported TerraPass for a couple of years until I was unfortunately ignored by this company. Not only did I have TerraPasses for a Prius and another fuel efficient vehicle, but I had plans to buy TerraPasses for the house and an upcoming trip via airplane. To help subsidize the cost, I shipped RipMobile (partnered with TerraPass for the donations) old cellphones so they would be able to resell them and subsidize my cost for the new TerraPasses. I never received the subsidized cost as promised and the follow up from TerraPass and RipMobile was not only poor but virtually non existent. I emailed and spoke to both companies via phone and was promised a correction "within a week." I waited six months (not an exagerration) to finally tell TerraPass that they had POOR follow up. The couldn't deny the lack of attention. Personally, I would try other companies other than TerraPass. There are other companies out there with similar or better causes who probably have better attention to detail with their business practices.