> the Sun is what heats and cools the earth The Sun very obviously heats the Earth. However, in what will come as a complete shock to many, things can have mul

> the Sun is what heats and cools the earth The Sun very obviously heats the Earth. However, in what will come as a complete shock to many, things can have multiple causes - particularly things which occur on a planetary scale. The Sun is a source of heat that everyone is well aware of. If that was all there was to it then the models would be extremely simple. We can measure the Sun, we know what it is doing. Building a climate model based on a single variable would be fantastic if it was predictive. Definitely important and good start - now add the other 10,000 variables to the model.