I think you misread my point. His claim was, we should all give up traveling and using the methods we use. Move closer etc...I think its a bit of a cop out to be saying that its up to the scientific and engineering community to be solving the world's problems like that.
we have technology and science to thank for helping to raise living standards to the point where we can afford to be having these first world problem discussions in the first place.
Ecologicial sustainability doesn't start with building statues of Greta Thunberg, and it doesn't come about from dictate from a higher power telling us that we have to cut our emisisons by 2030. It starts by doing your own little bit at home, by learning to bemore content with what you already have and living within your own means. Anyone and everyone can do thisg - make your day about going to the park, enjoying some fresh air, going for a run and spending quality time with your family and friends - all these things are free and don't screw up the planet.
To replace current mode of transport and come up with ideas how we can get around without them like he suggested.
Clearly that's not on anyone needing to get from point A to point B and feel guilty about it.