Re: ‘The hidden culprit of climate change' (The Weekend Sun letters page, April 6, 2023.

Relax Ken, the earth is not going to turn into another moon.

According to Dr Geoff Duffy, an Emeritus Professor of chemical and materials engineering at the University of Auckland, 99.8 per cent of all greenhouse gases in NZ are from natural sources.

In other words, only .2 per cent of all greenhouse gases in this country are man-made. If anyone thinks they can change the climate by reducing that .2 per cent they are delusional.

The Mediaeval Warm Period was warmer than today, and the Little Ice Age temperatures were cooler. The climate has always changed. We should be looking at mitigation and protection measures rather than giving billions to the lost cause of trying to change the climate. I suggest you read ‘Global Warming – A counter-blaste to the Man-made Global Warming Hypothesis' by Dr Kelvin Duncan for a good overview.

Paul Grimmer, Papamoa.