Sir: The appearance of Venus in the December sky ("Venus's rivers of molten chalk", 25 November) is indeed timely, coinciding with next week's Kyoto conference on global warming.
Venus experiences non-stop thunder, 3km visibility, sulphuric acid clouds and a temperature of 450C. As its atmosphere is mainly carbon dioxide (93 per cent), our planetary neighbour may offer a taste of things to come should delegates fail to grasp the global warming nettle.
Dr S MARIC
Sheffield
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