Record low levels of Antarctic sea ice are having grim consequences for penguins chicks yet to grow waterproof feathers. Subscribe to The Guardian on YouTube ► https://www.youtube.com/user/theguardian?sub_confirmation=1 The mass drowning of emperor penguin chicks as sea ice is melted by climate crisis-caused global heating has led the International Union for Conservation of Nature (IUCN) to declare the species officially in danger of extinction. Emperors are the largest penguin species and have