I recall an article comparing CO2 emissions of private jets verses commercial airlines a couple of years back. A bunch of assumptions were made, but the rough figure was five times higher per passenger mile. When you consider that people who use private jets are likely flying more than those who use commercial airlines, and that individuals are being asked to make sacrifices for the sake of reducing CO2 emissions, then yes it is consequential.
No - they think there's a palpable disconnect between the public environmental statements made by men like Zuck, and the way that they themselves behave.