The amount of CO2 trees absorb are calculated with scientifically developed methodologies and algorithms. We are not going to do it ourselves and leave this part to our partners. There are multiple factors they use to calculate that, such as, soil fertility, tree species, biomass area etc. You can dive more in depth here
https://verra.org/wp-content/uploads/2023/09/VM0047_ARR_v1.0-1.pdf So, there are some equations to calculate CO2, well that's totally new to me, as I never heard of it before, and I am not a technical person that I could check the equations and can understand them but I did looked up on your PDF and its quite good. I think you guys have done your homework well.
I would love to see your final project, but I guess you should work on your website layout a little more, as it's my personal view and other members might find it cool. Best of Luck.