I built this site, https://www.offshoots.io, myself, despite having a full time job, multiple kids and a wife to take care of, and barely any time. I'm incredibly proud of it, and i'm continuing to work on improving it every single day! Thanks to this wonderful community for the inspiration!
My site allows users to sign up and connect their bank/credit card, and select categories of purchases (such as "Gas Station" and "Farmers Market") that it will track. When users make a purchase in that category, my site will calculate the amount of carbon an average purchase in that category produces, and match with an organization working to fight climate change in a corresponding sector (so, Wind Energy to offset a Gas Station purchase). It will then send you an email with this information (carbon created, offset amount, offset organization, sector, etc) and a link that will allow you to click and process the payment (usually around a dollar or so). If no organization can be found in that sector, we default to planting a tree, which you can set to your default option.
I'm currently looking for 50 test users, since i know there are bound to be issues and i'd love to get user feedback / iterate on my site and make it better!
If you are interested in fighting climate change and helping a fellow hacker out, please head over to offshoots.io and sign up, and let me know on this post that you've joined!
Thank you all again for the inspiration!