An android app which gives you an idea of how much CO2(in Kg) is released from your family to the environment , and also gives you exact amount of mango trees to be planted to neutralize your family emission This app is available in play store https://play.google.com/store/apps/details?id=com.rm.co2planet .(Owned by me, last updated on Mar 6, 2023)
This app doesn't need any special permission to work .