If look up the original plan from 1980s, you will see that the German Green idea was to replace nuclear power and oil with renewable and coal and natural gas. Climate change was not very important, the most important was to remove nuclear power. (The founding idea of German Greens, as was for many anti-nuclear groups, was that by removing nuclear power they will remove the danger of nuclear weapons.)

Energie-Wende: Wachstum und Wohlstand ohne Erdöl und Uran [Energy transition: growth and prosperity without petroleum and uranium]

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