Would you eat protein brewed in a vat from bacteria instead of meat? "Nom nom nom!", you might say. George Monbiot probably agrees. One of the most influential thinkers on the future of of the planet, now he's interrogating what's on our dinner plate, and the staggering business of how it got there. He joins Natasha Mitchell to discuss his provocative book, Regenesis: how to feed the world without devouring the planet. And it all comes down to connecting with the Tolkienesque world beneath your feet.