The truth is that they did a lot of important things. In particular, they shaped the world around us to a much larger degree than most people realise. Trekkers visiting the Siberian tundra, the deserts of central Australia and the Amazonian rainforest believe that they have entered pristine landscapes, virtually untouched by human hands. But that’s an illusion. The foragers were there before us and they brought about dramatic changes even in the densest jungles and the most desolate wildernesses.

