Decoupling isn’t real if you look at the global compartment. That’s the reason you have to look at the whole planet rather than formerly industrialized countries, who’ve outsourced everything energy-intensive to Asia and elsewhere.

As to individual scale, it depends on how much pain you can stand. I heat with locally sourced firewood, though there’s also gas for hot water and the rest of the house. I DIY net electricity demand (currently 2 kWp, will be 4 kWp this month). Food calories are just not an option, though we garden a little, and have a small greenhouse for the veggies/herbs.