Michael Pollan on the labyrinth of human consciousness

<p>Why is it so hard for us humans to come to grips with what it means to be conscious? Bestselling author Michael Pollan talks to Matt Galloway about how scientists have tried - and often failed - to unlock the mysteries of consciousness, whether plants could be considered conscious, and why he believes that we need to "defend" human consciousness against those who may try to simulate it with computers and AI.</p>