godf on 26 June 2007
But if other sources of greenhouse gasses have been reasonably constant, and we're now adding to it, then it really makes no difference what level of natural greenhouse gasses were required to maintain previous temperature levels, human emmissions can still have just as much impact, regardless of the ratios between the two.
We only need a tiny % increase in the ammount of heat energy in the world to cause massive problems for humanity. Thinking 'Oh, less than 5% isn't that important' isn't really a sensible way of approaching things.
