The author of Farmageddon investigates the expansion of industrial farming worldwide, confronting 'Big Agriculture', where mega-farms, chemicals and animal cages are jeopardising the air we breathe, the water we drink, the food we eat and the nature we treasure.

But he also finds hope in the pioneers who are battling to bring landscapes back to life, who are rethinking farming methods, rediscovering traditional techniques and developing technologies to feed the global population.

In conversation with Nicola Cutcher, journalist, writer and documentary maker, who recently produced Rivercide, about Britain's polluted rivers.