dinahmo posted on 13th Feb at 11,34 that There is a proposal to create two dams across the North Sea (Norway to Scotland) and the English Channel (Cornwall to France) to control higher sea levels which will result from the melting of the polar ice caps. This seems to me to be a much better idea than Johnson's bridge across the Irish Sea.
There were articles about this in the media on 13th Feb, such as this one in the Guardian -
"In a paper to be published this month in the American Journal of Meteorology, Groeskamp and Joakim Kjellsson of the Geomar centre for ocean research in Kiel, Germany, say the idea is affordable and technically feasible – if intended more as “a warning of the immensity of the problem hanging over our heads”.
However, Cloke cautioned that a dam may not be the best use of the money. “Maybe we should be thinking about making populations resilient to flooding in different ways, and also think about what we can do to stop the climate getting worse – invest in keeping ourselves safe in the long term.”
“But in the final calculation, we must also take into account factors such as the loss of income from North Sea fishing, the increased costs for shipping across the North Sea, and the costs of gigantic pumps to transport all of the river water that currently flows into the North Sea to the other side of the dam.”
However, the costs and consequences of doing nothing about rising sea levels would ultimately be “many times higher”, they warned. The project “makes it almost tangible what the consequences of rising sea levels will be”, Groeskamp said.
The Intergovernmental Panel on Climate Change predicts that sea levels will rise by 30cm-60cm by 2100, even if the Paris climate accord pledges are met. If emissions continue on their present trends, it foresees an 84cm rise by 2100 and up to 5.4 metres by 2300.
“A rise of 10 metres by the year 2500 is predicted, according to the bleakest scenarios. This dam is therefore mainly a call to do something about climate change now. If we do nothing, this extreme dam might just be the only solution.”
A dam between the nearest points of Scotland and Norway would be 475km - as long as the distance from London to Manchester, or from Brussels to Munich,- that is about twelve times as long as across the nearest points of Scotland and Ireland. It would also cross depths greater that those in the North channel, and be far more exposed than "Boris's Folly", both in the building and maintenance of it and for its own survival.
The cost would be astronomically more than 20 billion (estimated between €250bn and €500bn - and I reckon it wouldn't work because the extra water would just go round to the west coast of the Uk and flood us from there.
Stopping the activities which exacerbate climate change would be better!