• Lighter-than-air ships  
  • How man copes with the cold  
  • Organisation of the measurement flights  
  • Flying conditions and risks during the expedition  
  • The measurement campaign  
  • Communications - Safety - Emergency assistance  
  • Earth observation satellites  
  • Our airship  
  • The earth's atmosphere  
  • Weather forecasting and modeling  
  • The climate and the north pole  
  • The solar energy balance  
  • The greenhouse effect  
  • The ice pack: frozen saltwater  
  • Icebergs : frozen seawater  
  • The arctic ice: climate archives  
  • Ice ages and landscapes  
  • The Arctic Ocean and the ocean currents  
  • Genesis of the arctic ocean  
  • Arctic plankton  
  • Oceanic biodiversity and the food chain  
  • Whales and other cetaceans  
  • Seals and walruses  
  • Arctic flora  
  • Arctic fauna  
  • Polar bears  
  • Birds of the arctic  
  • Evolution of species and climate  
  • Geography of the Arctic regions  
  • Geographic North Pole and magnetic North Pole  
  • Who owns the arctic?  
  • Exploring the deep north  
  • The Inuit people  
  • The other peoples of the deep North  
  • The Arctic today  
  • Man and arctic biodiversity  
  • Pollution in the arctic  
  • Climate warming: the natural cycles  
  • The increase in the greenhouse effect  
  • The impact of global warming  

Life on land
Evolution of species and climate

Ice ages and warmer periods: how life changes
Arctic flora and fauna are all well adapted to their extreme environment. Not only this but the climate in the Deep North has changed over the millennia, with a succession of ice ages (glaciation) and warmer periods, and Arctic flora and fauna have had to display a remarkable ability to adapt to changing climate patterns.

In colder periods, the forests pull back
About 7 million years ago, at the end of the Miocene, the climate in the Arctic regions became colder. As result, the abundant forests of broad-leaved species and conifers that covered much of Siberia and Alaska were gradually replaced by taiga. To the north of the forests, the tundra was born – a new and harsher milieu to which the species that inhabited the taiga and the high mountains simply had to adapt.

Reindeer and musk ox: different origins
The reindeer belongs to the cervidae, but the other members of this family today live in wooded regions. Biologists think the reindeer is descended from a cervida that lived in the boreal forests and then had to adapt to the open tundra terrain. The musk ox, on the other hand, is a member of the bovidae family, typically animals that live in exposed milieus (steppes, meadows, savannah). Its ancestors undoubtedly migrated from the steppes of Central Asia. Most of the Arctic animals originally inhabited the steppes of the forests.

Mammoth, Woolly rhino & Co
When Prehistoric Man roamed the Earth, some 10,000 years ago, he had to share the Northern Hemisphere and its harsh climate with mammoths, woolly rhinoceroses, sabre-toothed tigers and other large mammals. Biologists estimate that during that period some 30 to 40 species became extinct, possibly because of over-hunting but more probably because they were too slow to adapt to climate change.