The Green Revolution
Borlaug's legacy and the hidden cost
Description
In 1944, a thirty-year-old American plant pathologist named Norman Borlaug arrived in Mexico to work on a Rockefeller Foundation programme aimed at improving Mexican wheat. Mexico was importing roughly half its wheat at the time, and the local crop was being devastated by stem rust, a fungal disease that could wipe out a harvest in days. Borlaug had a doctorate from Minnesota, no Spanish, and no field experience in tropical agriculture. Over the next two decades, working at experimental stations in the Yaqui Valley and at high altitudes near Mexico City, he and his colleagues bred varieties of wheat that would change the trajectory of human agriculture.
By 1963, Mexico was self-sufficient in wheat. By 1970, when Borlaug received the Nobel Peace Prize, the same wheat varieties were transforming yields in India, Pakistan, Turkey, and across the developing world. The shorthand became the Green Revolution — a phrase coined in 1968 by William Gaud, head of USAID. The numbers are extraordinary. Yields of wheat and rice in Asia roughly tripled between 1960 and 1990. Famine, which had been a recurring feature of South Asian history, became dramatically less common. Some estimates credit the Green Revolution with averting starvation for upwards of a billion people.
The story is also more complicated than the headline. The wheat varieties Borlaug developed required intensive irrigation, large quantities of synthetic fertilizer, pesticides, and the institutional infrastructure to deliver these inputs to millions of farms. The agricultural system has been astonishingly productive and has come with consequences — depleted soils, falling water tables, polluted rivers, and the displacement of older, more diverse farming systems. The legacy is genuinely double-edged.
The question we're asking: what did Norman Borlaug accomplish, and what did the agricultural system he helped create produce alongside the food?
What we'll see: the wheat, the spread, the second revolution that did not happen, and the bill arriving now.
Table of contents
01A geneticist in the Yaqui Valley
The Rockefeller Foundation's Mexican Agricultural Program had begun in 1943, modelled on the foundation's work on yellow fever and hookworm. The premise was that scientific expertise applied to agricultural problems could produce gains comparable to those in public health. Borlaug joined the wheat improvement project under George Harrar. The first task was to breed wheat varieties that could resist the rust fungus. This was conventional plant breeding, technically ambitious but not revolutionary. Borlaug crossed thousands of varieties and selected the most promising for further breeding.
The shuttle breeding technique was Borlaug's most consequential innovation, and it came partly from impatience. The Mexican experimental stations were at very different latitudes and elevations. Conventional wisdom said wheat had to be bred to local conditions. Borlaug grew successive generations alternately at both sites, which halved the breeding cycle and accidentally produced varieties that were photoperiod-insensitive they could grow at a wide range of latitudes and day lengths. This would matter enormously when the wheat moved to South Asia.
02The wheat goes east
India in the mid-1960s was facing chronic food shortages. The country had been importing millions of tons of wheat annually, mostly from the United States under the Public Law 480 food aid programme. The 1965 and 1966 monsoons failed, producing severe drought across northern India. Famine was a real possibility. Subramaniam decided to gamble on the Mexican wheat varieties.
The introduction was not smooth. The 18,000 tons of seed shipped from Mexico in 1966 arrived at Bombay port and sat on the docks while bureaucratic disputes were resolved. Borlaug threatened to leave India if the seed was not distributed quickly. Indian scientists were sceptical of the imported varieties. The government pushed the introduction through anyway. The first harvest in 1968 produced yields that astonished everyone. Wheat production in Punjab rose roughly fivefold over the following decade.
03The bill that arrived later
The agricultural system was specific in its requirements. The semi-dwarf varieties produced their dramatic yields only with heavy applications of nitrogen fertilizer, produced through the Haber-Bosch process and dependent on fossil fuels. Total global synthetic nitrogen use roughly tripled between 1960 and 1990 and has continued growing. The wheat and rice also required reliable irrigation, which led to massive expansion of canal systems and tube wells across South Asia. India now has around twenty million groundwater wells, many drawing water faster than the aquifers refill.
Punjab, the showcase of the Indian Green Revolution, illustrates the pattern. The state's water table has been falling at roughly half a metre per year in many districts. Farmers have been drilling deeper wells, but the deeper water is increasingly saline. Soil organic matter in the most intensively farmed regions has declined sharply, and the soils now require larger applications of fertilizer to produce the same yields. Pesticide use has produced documented health effects in farming communities. The state has high rates of certain cancers, and the medical literature on what is informally called the cancer train a daily train carrying patients from Punjab to a treatment hospital in Rajasthan is considerable.
04What comes after
The Green Revolution that Borlaug catalysed plateaued in most of its target regions by the 1990s. Wheat and rice yields stopped rising at the rate they had for the previous thirty years, even with continued increases in inputs. The yield potential of the existing semi-dwarf varieties has been substantially harvested. The marginal returns to additional fertilizer and water have declined. Many of the most productive lands have been farmed intensively for two generations and show signs of soil exhaustion. The 1990s and 2000s saw repeated calls for a second Green Revolution, but it has not arrived in the form the first did.
What has arrived is a more dispersed set of approaches. Genetically modified crops Bt cotton, GM maize, Golden Rice extend genetic improvement using molecular tools. Drip irrigation reduces water use per hectare. No-till farming preserves soil organic matter. Precision agriculture uses sensors and satellite imagery to apply inputs only where needed. Each represents a real improvement, but none has produced the step-change of semi-dwarf wheat and rice in the 1960s. The remaining gains are incremental and require more sophisticated infrastructure than most smallholders have access to.
05Conclusion
Norman Borlaug died in 2009, at age 95, still working part of each year on agricultural problems. The phrase often attached to his obituary is the one about lives saved, and it is not wrong. The Green Revolution genuinely altered the trajectory of human nutrition. South Asia in 1965 was a region where famine was a recurring feature of public life. South Asia in 2025 is a region where obesity is now a more pressing public health problem than starvation. That transformation was not entirely the work of one wheat geneticist, but his work was at the centre of the technical change that made it possible.