1975: The first cancellation of a planned nuclear power plant occurred in Wyhl, Germany due to protests from "environmentalists".
Europeeans tend to have less disposable income and be less consumerist, smaller and better heated/insulated houses, less cars per household, &c.
A quick Google search suggests ~350g CO2 per KWh in Germany vs. ~400g in the US. Looks plausible to me. Germany uses coal but also has a very substantial share of renewables. Another quick search also shows that 60% of electricity in the US is from fossil fuels. The rest is nuclear and renewables in about equal amounts.
[1] https://www.euractiv.com/section/air-pollution/news/german-c...
As a result we're now relying on more coal and gas than the much cleaner nuclear energy. What lovely progress!