February 4th, 2011 08:15 AM

'At first glance it looks like a graphic from a Discovery Channel programme about a distant ice age. But this astonishing picture shows the world as it is today - with half the Northern Hemisphere covered with snow and ice. The image was released by the National Oceanic And Atmospheric Association (NOAA) on the day half of North America was in the grip of a severe winter storm.'

Read more: Most Of Northern Hemisphere Is Covered Under Snow, Ice