Before we decide if a zero-carbon economy by 2050 is worth the cost, we must know what the damage to our economy from global warming will be if we do nothing. Only then will we know how important and urgent action on global warming really is.
Estimates of the cost of global warming as a percentage of GDP to New Zealand are elusive. I drew a nil response when I asked for that information from James Shaw, the Minister for Climate Change, and from the Ministry for the Environment. Both said such an estimate was too hard to calculate.