I should have answered your question the other day:
They are the only party that sees the problem and has solutions that will work. The parties who can't see the problem clearly (the usual "market forces!" BS) will say otherwise......but then they caused the problem and have made it clear they can't fix it. So you can't trust anything they say about Green policies. National is still in denial about climate change......which today should be a big red flashing warning to everyone about ANYTHING that party says or does.