Yes, it is possible to live sustainably today, the problem is, nobody, save the odd eco hippy wants to do it. Usually it's called an off-grid lifestyle but living with a small carbon footprint is definitely doable. No propane patio heaters though.
Yes there is, you can ride a bicycle or walk, even drive in an electric car if you can recharge it from renewables but, given what we have to work with right now, today, a bus is a pretty good option too.
Oh....you mean there no sustainable way to cross the Atlantic. Well, duh. What sort of options would we be realistically
looking at here to make this change ? Do tell, Nikki.