R. Colmore (The Weekend Sun, October 4) cites the uncharacteristic recent growth of Greenland's mighty Jakobshaven Glacier to prove that not all glaciers are retreating. He adds this as 'evidence” to his flawed sea level arguments (Weekend Sun, July 19 – September 20) in his campaign to discredit the science of climate change and sea level rise.

As Mr Colmore himself mentions, NASA's evidence reveals that this glacier (most of it floating in a deep fiord) has thickened and lengthened again since 2016 thanks to an influx of cold water due to a temporary reversal of the North Atlantic Oscillation (NAO) which occurs every 5-20 years. However, its rejuvenation is expected to end when the NAO returns to its normal state. Meanwhile the surface of the vast ice sheet which feeds into it is now melting at an unprecedented rate.

Regarding P. Kelly's letter (Weekend Sun, October 4), I recommend him to study the actual science to understand why UN policy on climate change is anything but 'nonsense” and 'fraudulent”. Today's protesting youth are right on the mark in their calls for overdue action, whether you agree with their tactics or not.

Peter Otway, Omokoroa