In multiparty systems, a minority party (like the Green Party) will often compromise on issues that are not on their core platform in order to get support on th

In multiparty systems, a minority party (like the Green Party) will often compromise on issues that are not on their core platform in order to get support on their one or two key issues. One of the key issues for the Green Party in Germany was the banning of nuclear plants. They've had an enormous influence in actually getting Germany to make a drastic change and abandoning nuclear energy. This was no small feat as Germany is the leading European manufacturer and the home of Siemens, a major producer of nuclear technology. Although Fukushima was the tipping point, there had already been significant pressure on the German conservative party to at least prevent additional construction of new plants. Nevertheless, this success for the Green Party was due in part to them forming coalitions to support non-core issues such as the one you've mentioned.