Pat, my interest in science is as an amateur with no great degree of formal training other than perhaps, some common sense. I do not dispute the theory , but I feel that the obvious is often overlooked in seeking the abstract. Between catostrophic climatic events such as volcanic eruptions and cosmic collisions there are climatic cycles and cycles within cycles. Changes occur for many reasons and human pollution is certainly a factor. When I hear a comment from a leading scientist that "last year was the warmest on record" I tend to question both his expertese and his motive. I can still recall the fable of Chicken Little and the falling sky. I do not wish to belittle the subject; only to state that we should concentrate our resources where they will do the most good.
Man by nature is a nomad and up until the last ice age we would migrate as nature dictated. 25 thousand years later we have boxed ourselves in with national borders and a society that tries to control nature. In the long term this will not work. We are driven by economics and greed and I am afraid that old mother nature will prove us all to be fools!