The IPCC Climate Change reports once every five years are the absolute definitive resource for understanding global warming and climate change. Anybody wishing to understand climate change in a neutral atmosphere (the reports are amazingly free of politics) can do no better than to read all three volumes of the latest IPCC climate change report. This third volume focuses on ways to prevent or reduce harmful climate change (mitigation of climate change).
Just four caveats:
1) It helps to have a solid understanding of basic science terms and principles before reading this;
2) The text can be a little dry at times (after all, it is a scientific report);
3) The report was a little out-of-date by the time it was printed, because our understanding of climate change impacts have increased greatly since the basic research was conducted that was synthesized and placed into this report; and
4) If you are new to reading about climate change, this should probably not be your introduction to the subject (see caveats 1 and 2 above). You can buy four or five terrific climate change books for the price of this one volume alone - for example, Hell and High Water by Joseph Romm, Heat by George Monbiot, Boiling Point by Ross Gelbspan, The Weather Makers by Tim Flannery, and With Speed and Violence by Fred Pearce.
Until the next IPCC report is released in 2013, this third volume on Mitigation of Climate Change is worthy of reading if you want to get to the basic science of climate change.