build a app to calculate and how to reduce carbon foot print. We can suggest many ideas including energy efficiency, invest in renewables, conscious living, change super to green super fund that invests in green energy, buy back forests plant trees, ect. Give certificates and rewards for reducing with ultimate goal of becoming carbon negative.
carbon calculator like Zero Carbon by Mobitelio LTDA
https://appsto.re/au/FB-eu.i
https://appsto.re/au/FB-eu.i