CDU is still popular. Germany might have a prominent green party but that is about it. It's only been in the last few years that other parties started caring about climate change. It's probably because the greens managed to sneak in a CO2 tax.
The CDU was pretty much the only one that wanted to keep nuclear with while near everyone else (except for AfD iirc) opposing them. By the time Fukushima happened the public sentiment and opposition was too strong for the CDU to keep attempting to push for nuclear.
Blaming them on this specific issue is just odd when they literally had the least fault out of everyone.
