Cargill boss says climate risk 'too big to ignore'

The boss of the agricultural firm Cargill has said the risk of climate change is 'too big to ignore' and pledged to take action.

Dave MacLennan says he wants to root out deforestation in all of its agricultural supply chains.

Cargill is the biggest private US firm in terms of revenue.

Mr MacLennan was speaking to the BBC's Michelle Fleury in New York.