1) The document compares the catastrophe response systems in China and the US, focusing on China's 2008 Wenchuan earthquake and the US's 2005 Hurricane Katrina.
2) It outlines the index-based methodology used to assess Wenchuan earthquake impacts and the probability-based methodology used for Hurricane Katrina.
3) The response systems in each country are described, noting China's centralized top-down system and the US's more coordinated federal-state system. Lessons from each disaster were later incorporated into new policies.