Clay Mitchell controls his entire farm from a tractor. As it chugs across his fields in Iowa, deep in the US Midwest, he directs operations across the farm and checks crop prices on international markets. The tractor drives itself with inch-perfect accuracy, while he monitors and controls the entire grain handling system, his workshop and machines in the field remotely.

Like thousands of farmers across the world, Mr Mitchell is turning to computers to make agriculture more efficient and less gruelling.