25% and has cause temperatures to increase more than 0.7 C over the last hundred years.
             We hope that the forests will act as a sink for carbon dioxide but instead they are a net source. This is because the forests are being cut and burned adding 1 to 2 billion tons annually to the 6 billion tons of carbon already from industrial processes. Fortunately, the top 300 metres of oceans absorb most of the carbon dioxide emitted by burning fossil fuels.
             Other factors are known to increase the greenhouse effect. These factor are water vapour, methane, nitrous oxide, CFC's and other halo-carbons. Water vapour is also a major factor in what has been called the "super-green house effect" in the tropical Pacific ocean. Water vapour traps energy that has been radiated back to the atmosphere. The high concentration of H2O vapour contributes significantly to the heating of the ocean surface a
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