Your conclusions are rational.

If sustainability is important, we'll have to rethink our actions.

Imposing constraints inevitably reduces choices, but there remains plenty of options: * local vacation (this is a tough one, I realise) * enterprises that are sustainable: either marginal negative emissions (e.g. durable goods) or carbon neutral (perhaps via credits) * sustainable activities: hiking, sailing, stand up comedy * start cycling * reduce meat consumption

Admittedly I do poorly at adopting sustainable choices merely for the sake of sustainability.