It's two breeding cycles for maize.

Like everyone else, we grew maize.

Ethiopian maize farmers produced two years of bumper harvest.

led to an 80 percent collapse in maize prices in the country.

The farmers get three to four times the yields that they would with maize.

In Ethiopia, for example, the variation in maize prices from year to year is as much as 50 percent annually.

The next three biscuits are the foods that we decide to feed to livestock, the maize, the wheat and the soya.

By 2030, if the maize, or corn, varieties, which is the dominant crop 50 percent of the nutrition in Southern Africa are still in the field in 2030, we'll have a 30 percent decrease in production of maize because of the climate change already in 2030.

Ethiopia's agricultural market is 30 percent higher than South Africa's grain production, and, in fact, Ethiopia is the second largest maize producer in Africa.

I don't say let's go back to the Copper Canyons and live on corn and maize, which is the Tarahumara's preferred diet, but maybe there's somewhere in between.

I often think how times have changed because you see we do all this work just to keep our cows going but now a bit of silage boy and it's all done mechanically and you can go and sit down.

If you include not just the food that ends up in shops and restaurants, but also the food that people feed to livestock, the maize, the soy, the wheat, that humans could eat but choose to fatten livestock instead to produce increasing amounts of meat and dairy products, what you find is that most rich countries have between three and four times the amount of food that their population needs to feed itself.