From Will the Paris Accord Accelerate Climate Change? by Laurence J. Kotlikoff, Andrey Polbin and Andrey Zubarev 2016 at https://www.kotlikoff.net/node/551
I drew a blank when I asked a year ago whether the minister for climate change knew the cost of global warming to the New Zealand economy as a percentage of GDP. After one year, the sum total of his knowledge of the cost of global warming as a percentage of GDP is a passing reference in the Zero-Carbon Bill consultation documents.
The only information he has on the cost of global warming as a percentage of the GDP of New Zealand is information I supplied to him.
From http://www.spiegel.de/international/world/interview-hans-von-storch-on-problems-with-climate-change-models-a-906721.html interview with United Nations Intergovernmental Panel on Climate Change lead author Hans von Storch