The last topic of the climate change unit was risk assessment. View the following website, "How it All Ends" for a interesting (and strange) lesson in using risk assessment to aid in decision making. It is an interesting argument to take action to stop global warming.
"How it All Ends"
If you really what the above information with even more details see the following link by the same lecturer
"How it All End: The Nature of Science" (in three parts)