Sea ice is frozen sea water. Sea ice in the Arctic is disappearing fast and with it the phytoplankton that grow underneath and which the fish and polar bears feed on. This has lead to a remarkable decrease in the number of each species and for the polar bears it is catastrophic. Polar Bears depend on this source of food and often are stuck on small pieces of sea ice for months drifting in the sea. They are unable to reach land because the amount of sea ice is shrinking rapidly and polar bears are drowning. The average weight of polar bears has decreased by approximately one third of their normal weight in the past ten years and females only give birth to one cub or none, whereas only 10 years ago they gave birth to two or three cubs on average per year.

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