I don't think this is a good argument. For one, the left uses hypocrisy as a tool. They are not shamed by it. More importantly, the argument itself is easily countered logically. One can simply say that yes, plane flights emit CO2, but if we use those plane flights to save the world then it's worth it. After all, lots of plane flights happen every day regardless. When you try to cleverly win points against that, you just come off sounding like they guy in the well: https://i.imgur.com/rhqkiNw.jpg

Pointing out hypocrisy unrelated to activism is more effective. For example, Al Gore lives in a mansion that uses 20x the amount of energy as an average American home. There's no activist purpose to justify that, it's just excessive consumption by a wealthy elite.

I don't think this is a good argument. For one, the left uses hypocrisy as a tool. They are not shamed by it. More importantly, the argument itself is easily countered logically. One can simply say that yes, plane flights emit CO2, but if we use those plane flights to save the world then it's worth it. After all, lots of plane flights happen every day regardless. When you try to cleverly win points against that, you just come off sounding like they guy in the well: https://i.imgur.com/rhqkiNw.jpg