The Working Group I (The Physical Science Basis) of the IPCC has provided Frequently Asked Questions (as PDF) which have been taken directly from the chapters of the underlying Fifth Assessment Report (2013).
IPCC, 2013: Climate Change 2013: The Physical Science Basis. Contribution of Working Group I to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change [Stocker, T., Quin, D., Plattner, G-K., Tignor, M., Allen, S., Boschung, J., Nauels, A., Xia, Y., Bex, V., Midgley, P. (eds.)]. Cambridge University Press, Cambridge, United Kingdom and New York, NY, USA.