I was interested to read Rob Colmore's letter "Sea levels" pg 49, Friday August 30, 2019, considering that rising sea levels were the single data point that convinced me that climate change was real.
https://www.nationalgeographic.com/environment/global-warming/sea-level-rise/
I did find points that indicate a certain amount of detachment is necessary - for example, taking sea level data exclusively from the English south coast is misleading, because the English south coast is slowly sinking, while the Scottish north coast is slowly rising - long-term effects of the last Ice Age, also noticeable in the Baltic Sea region.
But one piece of data did make me sit up and pay even more attention - the bottom of the ocean is sinking.
https://www.livescience.com/61328-ocean-bottom-is-sinking.html
It should come as no surprise - water has weight, and worldwide the glaciers are shrinking. It makes me wonder what other factors are in the Fort Denison station records that Rob Colmore so confidently refers to. They may be very accurate; they may also be totally irrelevant. If the land is rising because the glaciers are shrinking, while the sea level is rising and the ocean bottom is sinking ... do the maths.
Wesley Parish, Bellevue
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