Thanks to synthetic fertilisers, Mr Borlaug points out, global cereal production tripled between 1950 and 2000, but the amount of land used increased by only 10%.

• 博拉格指出，多亏了人工化肥，全球谷类产量才得以从1950年到2000年间翻了三番，而所需耕地只增长了10%25。