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I haven’t seen this yet, but I remember a show from Discovery about this. “What would happen if, suddenly, humans disappeared from Earth”.
The bad news is that pets would be the first to suffer, specially the ones locked inside homes.
Curiously we wouldn’t have many catastrophes like nuclear accidents or damns breaking (at least for some time) because everything is very automated and many fail safes would engage.
The whole show took as base many cities that had to be abandoned in different ages. It was very interesting.
And even if there were catastrophes and nuclear fallout somewhere, it would negatively affect life for a century or two in some areas but eventually everything would normalize again .... and in a thousand years there would be a few signs that we had been here. And in a few thousand more, there would be no visible signs except for a few strange hills and humps. After that, archeologists would have to dig and study the soil to know that someone was here before.