I hate the term 'carbon footprint'.
It was designed in the late '90s by British Petroleum as part of their multi-stage advertising plan to try to offload the damage they were doing to the environment onto individuals. The goal was to make individuals chase down largely meaningless individual contributions to climate change and ignore the massive ones that corporations and governments cause. If you live in a country with road and rail infrastructure, a military, fire departments, public hospitals . . . any honest carbon footprint calculator will show that the majority of your carbon usage is baked into where you live and out of your control.
Do you have a any good sources on this? I've seen before but am curious about the ratio.
The upper middle class Americans around me have an outsized personal carbon footprint that probably exceeds the emissions that are out of their control. Personal changes can also influence others around us and eventually public institutions, I don't think we should discount the importance of improving our own carbon footprint.
It's hard to find one . . . since the idea of 'carbon footprint' was designed to foist responsibility onto individuals, calculators for your carbon footprint almost never take into account the stuff that individuals can't change. You will have to do some legwork to get specific numbers. For example, I live in Canada.
Maintaining one lane mile of urban highway is worth between 116,000 - 186,000 tons of CO2 emissions over a 50 year period (
https://www.jtc.sala.ubc.ca/reports/analysis-ghg-roads.pdf) or 2320 - 3720 tons of CO2 each year. Canada has 38,021 miles of highway (
https://en.wikipedia.org/wiki/National_Highway_System_(Canada)), so assuming that all highways are only 2 lane to get a conservative estimate that's about 76042 lane miles of highway. So a conservative estimate of the yearly costs of Canada's highways comes to 176,417,440 - 282,876,240 tons of CO2 each year. We've got 38,250,000 people, so each individual's share of just the highway CO2 emissions works out to 4.6 - 7.4 tons of CO2 . . .
just from maintaining highways alone.
The average Canadian's carbon footprint (excluding all those pesky government related things like highways that we pay for with our tax dollars) is 14.86 metric tons (
https://www.statista.com/statistics/1290653/per-capita-emissions-in-canada/#:~:text=The%20average%20Canadian%20emitted%2014.86%20metric%20tons%20of%20carbon%20dioxide%20in%202021.). So, conservatively, highway CO2 increases that by between a quarter and a half.