Re: ‘Global warming results overstated' (The Weekend Sun, January 27).

With respect to B Johnson, I seriously doubt there are ‘thousands' of dissenting earth, atmosphere or climate scientists out there.

I used to be undecided myself, and that was because I hadn't bothered to find things out myself. But an article in the British publication ‘New Scientist' about 2005 or 2006 changed my mind drastically. It mentioned the high tide level had been measured by harbourmasters and the like for more than 100, and it had risen. Along with the rise in carbon dioxide levels as long as they have been measured and likewise the overall average planetary temperature. I googled ‘sea level rise data' and one site - www.epa.gov/climate-indicators/climate-change-indicators-sea-level - indicates a change from 1880 to 2015, of almost 10 inches or 25cm.

The idea that several hundred harbourmasters in the 1880s and early-1900s would lie about sea level rise for purely 2001-plus political reasons is nonsense. But that is what climate change deniers imply.

Skepticism about the rate of change I can take. That can be answered with data. But denials are kind of weird and there's always some bridge or racecourse to be sold privately floating somewhere in the background.

W Parish, Bellevue.