The easiest way to learn about the science and physics of global warming is to read Climate Change: Evidence & Causes from the Royal Society an the American Academy of Sciences. This short booklet, which can be downloaded free of charge, summarizes most of the science in a very accessible form.
There is also an excellent history of climate science available on the web.
We would also encourage you to read the report 2 degrees of separation from PwC. It is encouraging to see that commercial organizations and global corporation take the problem of climate change very seriously.