My only car has two wheels: a Specialized 29er. How many does yours have?

In Jurmala we live in a 37 sq meter apt with a 12m2 balcony.

In Porto we live in a 51m2 apt.

If you live in a typically gigantic American suburban house, you're too inefficient and should shrink your space to the average of 1970 (down from over 2000 sq ft to about 1200ft2.

My millionaire brother in Amsterdam lives in a 3 story row house of 95m2.

If you can't think in sq meters, you're a stubborn American who refuses to join the rest of the world's metric system, another source of costly inefficiency.

The entire postwar suburban buildout of the USA has to be reversed back to much higher density housing that makes it idiot-proof easy for families with kids to safely and cheaply get around without a car. Out with the car and in with the bakfiets. If you don't know what a bakfiets is, you're a source of energy profligate inefficiency.

Essentially, copy the Dutch and the Finns, who do it best: https://www.youtube.com/results?search_query=not+just+bikes

That's my definition of efficiency.