Do you know of a good resource with which to explain the high school physics of radiative forcing?

I have some smart friends on the fence about the predicted effects of climate change. I don't have the science background to walk through radiative forcing, but could learn it if pointed in the right direction. I've already checked wikipedia, but finding something on this specific point hasn't been fruitful.

This bugs me, as I think it is:

1. The decisive point

2. Poorly understood by the public

3. Could be easily explained