Nah while I agree with some policy they comes out with the issue with the Green Party is they are uninformed environmentalists and fundamentalists. They are not coming from a position of knowledge - they're a mixture of politics degrees, social sciences, law, activists and what not - rather than climatologists, ecologists, geologists and other environmental sciences. This means they buy into the concept of nature being this thing separate from humanity and never changing existing in a state of equilibrium. Their underlying philosophy will always hamstring them. I suspect for example they would be amazed that some lakes naturally look like filthy poisonous buckets of ****, but some actually are.
Plonking windmills on some hills is good, but their other issue is you cannot separate environmental issues from the economy and various social issues. New Zealand is very reliant on agriculture, oil and mining. Tertiary industries are nice, but they are only there because of the primary industries, and tourism won't save you in a financial collapse because no one needs tourism. Everyone needs food and raw materials.
I've been working in the lower North Island over the summer on water quality and I'll be the first to acknowledge farming causes significant damage to not only bugs and fish but also to drinking water aquifers, but there are elements in the Green Party who want all agriculture and raw material extraction out the door and if that happens, goodbye first world status. Their fundamentalism against open cast mining (for example) means the more dangerous underground mining is encouraged (made even more dangerous by the appalling lack of regulation in the industry which creates death traps like Pike River - even if the men had made it to the escape shafts due to their nature all the hot air would have rushed up those shafts and burned them to death as they climbed), and if they want farming to have less of an impact then we need to go full speed ahead on GMOs - plants that can grow in a variety of conditions, cows who produce even more milk on less food - but of course they don't want genetic engineering either. We have a choice between a good standard of living and less cow ****, because we can't have both unless we science the **** out of it (and NZ is trying within the political limitations they have).
They are the wishful thinking chardonnay socialist (I heard or read that term the other day somewhere and it's fantastic) party who can get away with their prattling because they will never have to rule a country. If they did they would have to be far more pragmatic, and pragmatism is what separates them from Labour.