The standards probably have to be really lowered...
If we believe this data[1], one would have to live like a resident of Sri Lanka, Jamaica or Myanmar so that 1 earth is enough per year (other countries are available).
Pessimistically, with the planet we currently have, not all 10 billion can live decently, and the minority who control the weapons would probably rather resort to violence rather than share things equally (just look at the borders of the EU and USA - and yeah even left-leaning governments are probably "helpless", they know if they let in too many refugees, they'll be voted out of office as soon as possible).
"First, we can be nice to everybody, then will come a time we will have to content ourselves to try to be fair... finally, we will have to choose: their children or ours."
If we believe this data[1], one would have to live like a resident of Sri Lanka, Jamaica or Myanmar so that 1 earth is enough per year (other countries are available).
Pessimistically, with the planet we currently have, not all 10 billion can live decently, and the minority who control the weapons would probably rather resort to violence rather than share things equally (just look at the borders of the EU and USA - and yeah even left-leaning governments are probably "helpless", they know if they let in too many refugees, they'll be voted out of office as soon as possible).
[1] https://www.overshootday.org/how-many-earths-or-countries-do...