SaltyNZ:
The environment is absolutely the top priority. Just look at the credentials of some the new MPs this term - Lan Pham, Steve Abel, Scott Willis. The social justice aspect comes about because (apart from being the right thing to do) you can't have the environmental change without it. The poor will disproportionately pay the price of the catastrophes that we have locked in through past inaction, and they are also the least able to make changes to mitigate.
It appeared to me that most of the reasons they wouldn't consider a coalition with National were more to do with non-environmental ideological differences. Seemed to be cutting off their nose to spite their face to me. If the environment was truly a top priority then being part of the government also needed to be a top priority.
The credentials of their new MPs don't mean much when they're on the outside looking in.