Climate change has reached the indigenous Nenets people in the north of Siberia. The nomads' herds of reindeer move on thin ice. The warming in the Russian Arctic is becoming dramatically visible. Huge craters open in the thawing permafrost and expose dangerous viruses and bacteria. Forest floors dry out and the taiga catches on fire. The pack ice off the coast is melting and depriving polar bears of their habitat so that they approach human settlements in their desperation. The changes in the n...