Wellington is being recognised as an international trailblazer on sustainability.

It is the only New Zealand city to rate a mention in a survey carried out by business ethics and anti-corruption promoter the Ethisphere Institute. It has selected Wellington as one of 10 mid-sized cities around the globe walking the talk on green initiatives.

The institute's magazine mentions Wellington's well-established public transport system and the Southern Landfill project, which generates electricity through gas produced from waste.

Other mid-sized cities to rate a mention include Copenhagen, Edinburgh, Helsinki, Oslo, and Rotterdam.