Blue Ice

... Researchers were gathering more evidence all the time and I witnessed much of their work: in a crevasse in Antarctica where bubbles of air, trapped in the luminous Blue Ice, held clues about the ancient atmosphere; watching an Oxford professor kneeling in the Kalahari desert to count grains of sand to calculate how far the dunes might spread with global warming; and riding an armoured vehicle through Siberia to research how the permafrost is melting...