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The Arguments
Image from National Aeronautics and Space Administration, USA
Others would argue that carbon dioxide isn't the only greenhouse gas and that human emissions could tip up a finely balanced system.
New evidence shows that as the radiation coming from the sun varies (and sun-spot activity is one way of monitoring this) the earth seems to heat up or cool down. Solar activity very precisely matches the plot of temperature change over the last 100 years. It correlates well with the anomalous post-war temperature dip, when global carbon dioxide levels were rising.
