I think reducing CO2 emissions from a personal level is the wrong way to go about it. It needs to be addressed from a more higher level, because the majority of CO2 emissions cannot be attributed to a single person.

Take for example shipping, which uses 4.5% of global co2 emissions, yet most people haven't stepped on a ship in their lifetime, and never will!

Quote: "annual emissions from the world's merchant fleet have already reached 1.12bn tonnes of CO2, or nearly 4.5% of all global emissions" https://www.theguardian.com/environment/2008/feb/13/climatec...

Also, note that aircraft are not limited to carrying passengers... They also carry cargo.