As has been pointed out, there are a lot more people (and therefore a lot more houses, offices, etc.) now than even 30 years ago. Per-capita emissions are also

As has been pointed out, there are a lot more people (and therefore a lot more houses, offices, etc.) now than even 30 years ago. Per-capita emissions are also much higher - US, China, and UK emissions per capita since 1751: https://www.researchgate.net/figure/Historical-CO2-per-capita-emissions-in-tons-in-the-UK-the-USA-and-China-1751-2012_fig1_327586945 https://www.researchgate.net/figure/Historical-CO2-per-capit... (data: https://data.ess-dive.lbl.gov/view/doi:10.3334/CDIAC/00001_V2017 https://data.ess-dive.lbl.gov/view/doi:10.3334/CDIAC/00001_V... ) This is unsurprising - though heating and cooking require a significant amount of energy even in the modern day, they only account for 23% of global energy usage (https://www.iea.org/reports/renewables-2019/heat https://www.iea.org/reports/renewables-2019/heat). The largest energy user is transportation (35%) followed by manufacturing (20%) (https://www.iea.org/data-and-statistics/charts/largest-end-uses-of-energy-by-sector-in-selected-iea-countries-2019 https://www.iea.org/data-and-statistics/charts/largest-end-u...), neither of which were probably much of a factor in the pre-industrial world.