The Royal Society

Feeding the World without Costing the Earth | The Royal Society

The Royal Society talk examined how humanity can feed a projected eight‑to‑ten billion people without further degrading the planet. Andrew highlighted that modern agriculture has remarkably outstripped population growth since 1961, yet it now underpins a biodiversity crisis, accounting for roughly 30 % of global greenhouse‑gas emissions, extensive soil depletion, and the loss of habitats that threatens over a third of species. Key data points underscored the urgency: amphibian, reptile and fish populations have collapsed by three‑quarters since the 1970s, and cropland demand could triple in parts of sub‑Saharan Africa by 2075. The speaker argued that demand‑side actions—cutting ruminant meat, curbing bio‑fuel crops, and reducing food waste through taxes and public campaigns—can cut emissions and extinction pressure, but alone they fall short of stabilising land use. Illustrative examples included Charles Godfrey’s warning that “if we fail on food we fail on everything,” Emma Garnett’s experiments showing that simply doubling vegetarian options in buffets boosted plant‑based uptake by up to 80 %, and London’s one‑month advertising ban that slashed household calorie purchases by 7 %. The analysis also presented Yi Gong’s model, which shows that only a combined shift toward low‑meat diets, halved food waste, and a 25 % closure of yield gaps can prevent further cropland expansion. The overarching implication is clear: meeting future food needs while preserving biodiversity demands a dual strategy. Policymakers must pair demand‑reduction measures with aggressive investment in yield‑gap research and sustainable farming practices, recognizing that land‑sharing alone reduces yields and requires compensation mechanisms. Only an integrated approach can halt habitat loss, curb emissions, and secure food security for the coming decades.