> fossil fuel cars

All or almost all of fire is my guess. My guess is that celebratory fire is last to go, bonfires, fireworks, in 2070 probably roasting marshmallows is at the edge of reasonable behaviour, but the idea that we deliberately burned things as part of normal life will seem very odd.

In 1870 fire is the usual (and incredibly wasteful) way humans make light and heat everywhere. In 1970 there's more abstraction, the light is electrical but from thermal generation, so there is still fire but it's somewhere else, and your heat is more likely from fire inside a metal box in a distant room, a gas, oil or in some cases coal boiler to heat air or water.

My guess is that even in pessimistic models in 2070 that's all electrical and the electricity is generated from sources which do not involve fire. PV, wind, hydro, even the geothermal and nuclear plants don't actually make fire to heat steam, they're just hot.

Fires—interesting point.

I'm in a neighborhood in Omaha, Nebraska that is maybe 5 years old—new housing development. There are no chimneys on any of the homes.

When I was in the Bay Area, sure, not a surprise. I am surprised the Midwaste gives a shit.

(To be sure, everyone seems to have fire pits in their backyards, ha ha. You take what you can get, I suppose.)