There's actually quite a bit of theoretical stuff about it on the internet if you look long and hard. I find it interesting how the global average temps. really started to take off in the mid 1990s when cell phone use started to really take off. As well, this is when the Chinese and India economies also started to take off, thereby spewing higher and higher amounts of carbon from coal into the atmosphere.  Are these factors interrelated?  Coincidence or correlation? Good questions and definitely worth studying.