The Elder Brothers are the Kogi, a hidden civilisation in northern Colombia that survived when the empires of the Incas and Aztecs were destroyed. The Heart of the World is the pyramid-shaped mountain they occupy, containing every climate on earth. Their warning is that we are changing the climate and causing the earth to die, and that is why they have decided to end four centuries of isolation. They say we must learn to respect their wisdom, or perish.
With Donald Pleasence and Jack Shepherd as the voices of the priests. Presented and produced by Alan Ereira.
Book: same title, £15.95, from retailers
Feature: page 25