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US President George W Bush says carbon dioxide – the main greenhouse gas – is not a pollutant, turning his back on nine years of climate change negotiations and causing controversy. How the evolution of plants changed the Earth's atmosphere. Survival strategies of Antarctic lifeforms are being studied by scientists for clues to how life might survive in space. A new written language devised in the USA to help deaf children learn to read. What does your choice of perfume say about your genes?