The root of the German Green party goes back to anti-nuclear and anti-war movements from 1960s.

https://en.wikipedia.org/wiki/Anti-nuclear_movement

"Before the 1980s, it was unclear whether the warming effect of increased greenhouse gases was stronger than the cooling effect of airborne particulates in air pollution."

https://en.wikipedia.org/wiki/Climate_change

The original 1980 plan for the Energiewende "Energie-Wende: Wachstum und Wohlstand ohne Erdöl und Uran" called for Germany to move towards "coal+gas" or "coal+solar" scenario. Only later were added any consideration for climate change, but the highest priority, the big evil, was nuclear technology.

Greenpeace has it's roots also in the opposition to underground nuclear weapon tests. https://en.wikipedia.org/wiki/Greenpeace#Origins

France did not get it totally right. We decomissionned superphénix for mostly dogmatic reasons, and also halted the Astrid project (although it look like it may be restarted we only lost 10 years)

Don't forget a large Russian campaign in Europe to discredit all energy sources that don't involve buying from Russia.

Financing green movements, working with governments, especially Germany (Gerhard Schröder now holds good positions in Russian energy companies, Angela Merkel had good relationship with Putin). Puting worked in Germany as KGB agent before his ascension.