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Verulam

O2 emissions Professor Arthur Bolton has written from Edinburgh: We hear a lot about greenhouse gases nowadays, especially from commentators who understand little about it. A recent TV presentation showed dramatic pictures of buildings on the east coast falling down cliffs into the sea and pictures of 20ft waves breaking over sea walls. The commentator’s point was that it was all due to global warming, with the ‘proof’ being that the sea level had risen 5mm during the last 50 years. Engineers know that a depression over the North Sea can cause a surge of value many dozens of times this figure - so what is the real situation?