Consider the below chart of Arctic Sea ice in September of each year: 
What is causing the loss of sea ice?
Definitions:
Remarkable Healing
The process of recovering from an injury or illness in an impressively rapid or efficient manner.
Stackelberg Model
A strategic game theory model that describes a market structure in which one firm (the leader) sets its output or price first, and then other firms (followers) make their decisions sequentially.
Reaction Curve
A graphical representation in economics that shows how one player’s optimal strategy choice depends on the strategy choice of another player.
Cournot Model
An economic model used to describe an industry structure in which companies compete on the quantity of output they will produce, assuming that their competitor's decisions are fixed.
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