Far away at the North Pole live two polar bear brothers. The older one is named Big Bear; the younger one, Little Bear.

Big Bear and Little Bear are crying. The two brothers got separated from their mother after the temperature of the Earth's surface rose, causing the ice cap at the North Pole to melt and gaps to open up in the ice. They are determined to find their mother one day, so that they can live together as a family again.

Big Bear and Little Bear are the main characters in a children's book about global warming. They are the creation of world-renowned Japanese designer Katoh Shinzi.