Davi Kopenawa sits opposite me looking agitated. His small brown hands turn a folded piece of paper over and over. It’s an email from his people, the Yanomami community in the heart of the Brazilian Amazon:

‘Please tell journalists that the invaders are increasing. Europeans need to know what’s happening. The world needs to know that we are being invaded again – lots of planes and helicopters and boats – we need action urgently. We need to get the goldminers out.’