Billowing Polar Bears

Oh, the ephemeral fragility of animals...still, I'm a little befuddled. What social message are they trying to get across? Seems a bit convoluted, i.e., they are encouraging you to ride the subway, to fight global warming, and consequently save the polar bears. Hence, when the subway propels itself speedily under the pavement and creates the great whoosh of air that stirs the polar bears into life, the average pedestrian is supposed to comprehend this rather obtuse message. Well, if you live in the 21st-century and tend to avoid hiding under rocks, polar bears are the ubiquitous poster children of global warming. Interesting archetype.