From the rulebook intro:

"On the South Pole, families of penguins live happily until the temperature increases from effect of global warming, resulting from activities of people in the cities which releases Carbon Dioxide (CO2). Icebergs begin to melt, leaving penguins with no place to stay out of water. A cooperativve game of helping one another to bring the penguins to the safe land. A perfect game to learn about global warming."