iandwk...It's true that sometimes the scientists can be wrong. But, in this case the predictions, made with mathematical models, clearly point to warming and measurements are supporting the predictions. The nature of global warming substances is that they allow the radiation from the sun to pass through to the ground, but absorb much of the longer wavelength radiation from the ground before it escapes to space. It's fairly straightforward when you look at a simplified model. It's sort of the opposite of what clouds do. The really complicated part of it is when you look at a a 3-d model of the entire atmosphere and the earth's surface.
What is true is that natural effects like solar activity can overwhelm the effects of what we do by putting more CO2 in the atmosphere. But, the "global warming" that we are concerned with is superimposed on top of the natural cycles.
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