Recommended reading - natural radiative forcing
For a nice review of orbital forcing you can also watch this series of videos from the Khan Academy.
These suggested articles from the IPCC report of 2013 (WG1 AR5) will give you a more in-depth background on the topics covered in the video in step 1.4:
For an introduction to natural radiative forcing you should study chapter 5.2 “Pre-Industrial Perspective on Radiative Forcing Factors”.
(Chapter 5 also gives an introduction to paleoclimate archives which will be the topic of next weeks lecture.)
For a review of solar and volcanic forcing you should study Chapter 8.4 on “Natural Radiative Forcing Changes: Solar and Volcanic”.
(Chapter 8 also gives an introduction of anthropogenic as well as natural radiative forcing in general, parts of which will be covered in video in step 1.9 of this week.)
© University of Bergen/IPCC 2013