I consume ~30kg per week of petroleum for my (quite fuel efficient) car, or 1500kg petroleum annually.

I consume maybe somewhere on the order of 2kg per week (100kg/yr) in the form of plastic packaging, toothpaste, rubber, asphalt, etc. And most of this consumption results in solid waste or other inert storage, as opposed to the generation of CO2.

Eliminating fossil fuels for energy and heating uses will not mean "you're basically back in 1800s" - those sorts of uses are not as relevant to climate change. You'll still be able to buy tires and toothpaste (though the economics of something like asphalt, which is almost a waste product unless you're doing cracking, might result in alternative materials trials for road surfacing treatments, particularly in urban areas. Interlock pavers are particularly suitable for low-strength situations where asphalt is currently used due to artificially low prices)