For example, according to the Carbon Footprint Factsheet published on the UoM website[1], beef is only 6.61 pounds (~= 3kg) CO2 per serving (4oz ~= 0.12kg). You'd have to eat a lot of meat to produce an amount of CO2 comparable to that caused by a single flight.
Newer cars in EU are emitting around 110g CO2/km[3], so the Helsinki-Okinawa trip would result in an 8157km*110g/1000 ~= 900kg of CO2. Still less than a flight. However, according to Wikipedia[4], the flight CO2 emissions in EU are at ~100g/km per passenger which contradicts the co2.myclimate.org calculator unless the global efficiency figures are much worse than EU. Flights also emit nitrogen oxides which have a stronger effect at higher altitudes.
A carbon tax enforced by the governments would be the most effective measure[2] AFAIK.
[0]: https://co2.myclimate.org/en/portfolios?calculation_id=19789...
[1]: http://css.umich.edu/factsheets/carbon-footprint-factsheet
[2]: https://www.reddit.com/r/Economics/wiki/faq_carbonpricing
[3]: https://ec.europa.eu/clima/policies/transport/vehicles/cars_...
[4]: https://en.wikipedia.org/wiki/Environmental_impact_of_aviati...