We're currently under a Labour majority (though James Shaw - the environment minister is Green).
There's a bit of a swing back toward National, hobbled in a very large part by their own incompetence, but this will go nowhere if they get back into power.
As an example of their attitudes, last time they were in it was found that basically every body of water in the country had pollution levels in excess of defined quality standards.
Their solution was to change the standards (I'm not sure if the subsequent backlash changed their minds) so that the water was no longer polluted (by definition).
Am I suggesting that we do nothing? No, but unless there's buy in from across the political spectrum (there won't be) I struggle to see how this can acheive anything.