Arctic: Our Frozen Planet Trailer | BBC Earth

Description: At the top of our planet lies a magical realm of snow and ice – the Arctic. Every year it is transformed by an annual cycle of freeze and thaw. For millennia, this steady seasonal beat has allowed life to thrive. But our planet is warming, upsetting this natural balance and the Arctic is changing faster than anywhere else on Earth. Scientists are now discovering that what happens here, affects us all.