There is a Dr Bevan Marten, from Victoria University, who's written a number of very good papers on why New Zealand should have formalised the MARPOL Annex IV provisions far earlier than we have. In amongst it, he says—and this was back in 2016—that "The global conversation around the amount of pollutants that enter [the] earth's atmosphere is impossible to ignore, and shipping-related emissions are no exception." We, of course, by virtue of our position on the globe, rely probably more so than just about any other nation in the world on reliable shipping networks between ourselves and the rest of the world. We are literally surrounded by the largest moat in the world, so shipping plays a huge part in our ability to be functioning as a prosperous First World economy.