“Of the 6,000 plant species humans have eaten over time, the world now mostly grows and consumes only nine, of which just three – rice, wheat and maize – provide about 50% of all calories humans consume. Add potato, barley, palm oil, soy and sugar to the mix, and you have 75% of all the calories. But diversity within these crops is also disappearing, as we rely on an ever-smaller number of high-yielding varieties.”
