About 50% of New Zealand's greenhouse gases are not carbon dioxide, being mostly methane and nitrous oxide. Consequently the exchange rates between different gases - that is their CO2 equivalence - could have significant effects on the cost to New Zealand of meeting international emissions...

As we emerge from a deep and long recession, the debate must shift again to how New Zealand can lift its productivity growth rate. New Zealand has already done much work in getting the economic environment right for business growth. The reforms of the 1980s and early 1990s removed many of the...