David Attenborough reveals how scientists measure the changes in the polar regions and what they mean for the animals and people who live there, as well as for the whole planet.

After non-stop summer months, the polar regions have expanded maximally, abundant food turns even the bears sociable. However the shortening of days soon starts reversing the process as frost expands the ice again. So many seasonal migrations turn too, mainly leaving for warmer regions. A stunning exception are the giant emperor penguins, who arrive to mate, lay and raise their eggs in heroic defiance of the planet s harshest conditions.

Following in the tradition of previous Blizzard expansion sets, Warcraft III: The Frozen Throne provides gamers with a vast new chapter in the epic Warcraft saga. In the single-player campaign, players revisit the war-torn world of Azeroth. Several months have passed since Archimonde and the Burning Legion were defeated at the battle of Mount Hyjal, yet a new threat has arisen throughout the land...