You want high population density as it makes sharing resources easier. The per capita emissions of a Londoner are at 3.3t. However UK is at 6t.

Also some processes make sense to be moved to the grid, even when they increase electricity generation. EVs are lower emissions then a petrol engine, even with coal electricity.

Otherwise a decrease in consumption is key. However only to a level, where we can provide the basics for everybody. Right now that means we also need more green tech.