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<b>Climate Fear As Carbon Levels Soar</b><br /><br />LINK<br /><br />An unexplained and unprecedented rise in carbon dioxide in the atmosphere two years running has raised fears that the world may be on the brink of runaway global warming. <br /><br />Scientists are baffled why the quantity of the main greenhouse gas has leapt in a two-year period and are concerned that the Earth's natural systems are no longer able to absorb as much as in the past. <br /><br />The findings will be discussed tomorrow by the government's chief scientist, Dr David King, at the annual Greenpeace business lecture. <br /><br />Measurements of CO2 in the atmosphere have been continuous for almost 50 years at Mauna Loa Observatory, 12,000ft up a mountain in Hawaii, regarded as far enough away from any carbon dioxide source to be a reliable measuring point. <br /><br />In recent decades CO2 increased on average by 1.5 parts per million (ppm) a year because of the amount of oil, coal and gas burnt, but has now jumped to more than 2 ppm in 2002 and 2003. <br /><br />Above or below average rises in CO2 levels in the atmosphere have been explained in the past by natural events. <br /><br />When the Pacific warms up during El Niño - a disruptive weather pattern caused by weakening trade winds - the amount of carbon dioxide rises dramatically because warm oceans emit CO2 rather than absorb it. <br /><br />But scientists are puzzled because over the past two years, when the increases have been 2.08 ppm and 2.54 ppm respectively, there has been no El Niño. <br /><br />Charles Keeling, the man who began the observations in 1958 as a young climate scientist, is now 74 and still working in the field. <br /><br />He said yesterday: "The rise in the annual rate to above two parts per million for two consecutive years is a real phenomenon. <br /><br />"It is possible that this is merely a reflection of natural events like previous peaks