Final answer:
The first step in the hypothesized warm arctic cold continents pattern is a prolonged warm period followed by global cooling and the formation of permanent ice sheets in Antarctica.
Step-by-step explanation:
The first step in the hypothesized warm arctic cold continents pattern is a prolonged warm period whose cause is still debated. This warm period is followed by global cooling driven by lowering CO2 levels and changes in ocean circulation. As a result, permanent ice sheets form in Antarctica, creating the cold continents pattern.