This has actually been on my mind lately and I've been looking for statistics, from Denmark, but haven't been able to find any going back far enough.
My assumptions is that we in the late 1940s through the 1950s had achieved a reasonable standard of living, but perhaps not available to all. Even if we assume that everyone in a country has access to the same, high, late 1950s standard of living, but applied modern technology, like improved insulation, district heating, EVs, energy efficient light bulbs and appliances, then how much would that lower (or raise) our energy usage? More of the energy would surely be moved to electricity, from coal, gas and oil delivered directly to our home, but is it enough chance the environmental impact?