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 user 2005-04-04 at 10:43:00 am Views: 86
  • #29529
    Carbon dioxide continues its rise


    The atmospheric concentration of the greenhouse gas carbon
    dioxide has reached a new high, say US researchers.

    The figures – 378 parts per million (ppm) – were gathered by a Hawaiian lab
    regarded by experts as one of the most reliable in climate research.

    The rise in the past year is smaller than it was in the previous two years.

    But the trend remains upwards, as it has for every year since measurements
    began on top of the Mauna Loa volcano nearly half a century ago.

    The research was carried out by the US government’s Climate Monitoring
    Diagnostics Laboratory, part of the National Oceanic and Atmospheric
    Administration (Noaa).

    A good mix

    The laboratory’s director, Dr Pieter Tans, told the BBC: “The most striking
    thing about the data is that we’ve seen an increase in carbon dioxide levels
    every single year since 1958.”

    At an altitude of 3,500m (11,500ft), the research station must rank as one of
    the world’s most spectacular and most remote scientific outposts.

    Reaching it involves leaving the tropical heat and humidity of the Hawaiian
    coast and climbing up a narrow road that twists through barren fields of
    solidified lava.

    The thin Pacific air is ideal for this research since it is
    “well-mixed”, meaning that there is no obvious nearby source of pollution, such
    as a heavy industry, or a natural “sink”, such as forest which would absorb CO2.

    For that reason the data from Mauna Loa has come to be seen as the benchmark
    by which atmospheric data is judged.

    According to Dr Tans, one significant finding is that the annual rate at
    which the CO2 is rising has itself increased.

    The growth rate over the past decade was about twice as fast as that found in
    the 1960s.

    He says that variations in the growth rate year by year can be explained by
    natural factors; for example, changes in the rate at which plants and the oceans
    soak up carbon dioxide.

    But he and his colleagues conclude that the steady rise overall can be
    attributed to man-made emissions of carbon.

    Dr David Hoffman, director of Noaa’s Climate Monitoring and Diagnostics
    Laboratory, said: “Even though man’s contribution is not increasing dramatically
    - in fact it’s steady – it is adding up; there’s a cumulative increase.”

    In the year that the long-awaited Kyoto treaty finally came into force, with
    its aim of constraining greenhouse gases, the latest evidence highlights what a
    challenge that will be.