I think you'll find epicyclo that if we can reduce the rate that deforestation is occuring the total effect of man made global warming can be reduced or offset. If you weren't aware. Alot of people in this thread don't seem to understand. There is a 'carbon cycle'. In many ways similar to the water cycle where by carbon is taken from the atmosphere and eventually replaced back into it. This cycle must exist for life on Earth to exist and unsurprisingly it causes global warming again which is needed for life on Earth. However, for the lamen such as I who have no green credentials or no higher understanding of increased global warming. By burning fossils with carbon in them to get energy we are increasing carbon levels in the atmosphere and by destroying the trees that absorb some of the carbon in the atmosphere, to grow. We are impacting negativley on the planets delicate balance. The reduced number of trees in the Amazon rain forest is having an unknown affect on other carbon 'sinks' such as algae in the oceans. Basically the rain forests as I understand it are an intermediate step if you like for carbon being taken and returned from the atmosphere, far more is abosorbed by the algae however we are impeding the effectivness of this algae as we are pushing it to a saturated point. Then after that no one really knows what will happen but it'll probably not be great. Us westeners probably won't be too badly affected just our servents in the developing world will suffer. But who care about them they just grow rice for us and scrap our ships.
Also worth pointing out its not so much Earth we're screwing its 'life on Earth'. The Earth with afew million years can return itself to an equilibrium. Or a state of smaller sporadic changes.
As for the heat of the sun I think that has very little to do with ice ages global temperature etc. I think you will find global temperature varies more with the orbit of the Earth around the sun and the ratio of green house gases in the atmosphere. Read Mallankavich cycles (if thats how you spell his name).
