a.) Complex systems such as the climate are characterized by thresholds and feedback loops. Describe 2 positive feedback loops for global climate change. Describe 2 negative feedback loops for global climate change.

b.) If all of the ice in the Arctic Ocean were to melt, how high would global sea-level rise? If all the ice in Greenland were to melt, how high would global sea-level rise? How likely is this in the next 10 years?

c.) Describe three (3) specific cities that would be catastrophically impacted by sea-level rise by 2100. Please provide evidence and mechanisms in your response.