Cloverly's founders include ecommerce veterans, and we're really sensitive about making the Cloverly checkout procedure as frictionless as possible. Fortunately, our clients have not reported any negative effect on conversion or bounce rates.
Ecommerce customers see one short sentence giving them an option to pay extra to green their shipping. They can click a checkbox, or not, and then complete their order. That's it. There is an optional link they can click for details about the offsetting, but they're free to ignore it.