The point is German Green party has the most anti-authoritarian external political stance of all, and have been opposed to Nord Stream II from the very beginning. They might exchange it for compromise on something else, sure, but will have to explain it to their own party members.
Not against shale gas which is worse than natural gas. They opposed it because of environmental concerns of fossil fuels. It would be much better to just get gas from Russia, which we did for several decades.