CSIRO has been doing megatrends and future scenarios and they have a graph showing the relative perceived likelihood of different scenarios plotted against the estimated damage they would do (measured in dollars).

Top for them is asset price collapse with likelihood above 20% and severity in US$ more than 1 trillion.

The relevant document is ‘Our Future World: an analysis of global trends shocks and scenarios’. There is a link to it under The Head – Climate Change.