5 ideas
The book says Green Revolution seeds should be called 'high-response varieties' because their yield advantage exists only when they get heavy irrigation, synthetic fertiliser and pesticide. Calling them 'high-yield' hides this dependency. It turns a package of purchased inputs into an apparent property of the seed itself.
Productivity counted as grain output of one crop per hectare leaves out what the older system also produced: straw for fodder and fuel, pulses and oilseeds grown alongside, and soil fertility kept up by rotation. Measured across the whole farm ecosystem, and against the water and energy put in, the monoculture's gains look much smaller or even negative. What you choose to count decides whether a technology looks efficient.
Thirsty rice-wheat rotations and subsidised tubewells pulled groundwater down faster than it recharged. Canal irrigation without drainage caused waterlogging and salinity, and continuous chemical fertilising exhausted micronutrients such as zinc. The book argues that yields were bought by drawing down ecological capital, which made the gains temporary.
Farmers used to save their own seed and use manure. Under the new model they had to buy seed, fertiliser, pesticide and fuel every season, often on credit. As input costs rose, returns shrank and soils declined, and small farmers fell into debt and lost land. The mechanism is a shift from a closed on-farm cycle to a market-dependent one, which moves risk onto the cultivator.
Replacing thousands of locally adapted landraces with a few genetically narrow varieties wiped out the crop diversity that had buffered farmers against pests, drought and disease. Uniform crops across a region are vulnerable to single epidemics, which then require more pesticide. The book presents the loss of seed diversity as a loss of farmers' knowledge and independence as well as a biological loss.