New Zealand ranks first in the world for environmental sustainability, according to the 2006 Environmental Performance Index. But while this is something to be proud of, and which confirms our self-image as being "clean and green", it doesn't mean we can stop worrying about the environment. As is clear from our country profile [PDF; we're on page 85], we have a long way to go. We rate poorly for overfishing, wilderness protection, and for renewable energy (though the latter is very high by world standards). While we rate very highly for water resources, this is measured by overconsumption and nitrogen runoff, both of which are getting worse. If we wish to maintain this ranking, we are going to have to work harder on improving these areas, otherwise we won't be "clean and green" so much as "dirty and brown".