When Kip Andersen discovered that animal agriculture generates more greenhouse gases than the entire transport sector combined, he couldn't understand why major environmental organisations were barely discussing it. The Sustainability Secret — the book companion to the documentary Cowspiracy — is his attempt to answer that question and make the case that what we eat is the most important environmental choice any individual makes.
What Is This Book?
The book expands on the documentary’s argument with more data, more interviews, and more space to develop the underlying case. It covers the full environmental footprint of animal agriculture: land use (animal agriculture uses 45% of the Earth’s ice-free land), water consumption (2,500 litres per pound of beef), ocean dead zones, deforestation, and methane emissions from livestock.
It also addresses the political economy of why this is underdiscussed: the power of agricultural lobbies, the dependence of major environmental organisations on donations from industries with ties to animal agriculture, and the cultural sensitivity of challenging dietary norms.
The Land Use Argument
The most compelling section is the land use analysis. Producing a calorie of meat requires dramatically more land than producing a calorie of plant food. The logical implication — that shifting to plant-based diets would free up enormous amounts of land for carbon sequestration, biodiversity, or simply being left alone — is one of the most significant levers available for environmental improvement at scale.
Animal agriculture is responsible for more greenhouse gas emissions than all transportation combined. Yet you can go years studying environmentalism without encountering this fact. Ask yourself why.
— Kip Andersen and Keegan Kuhn, The Sustainability Secret
The Institutional Silence
The most politically pointed sections examine why the world’s largest environmental organisations — Greenpeace, Sierra Club, WWF — have historically avoided direct confrontation with animal agriculture. The book’s answer, documented through interviews, is a combination of donor pressure, cultural sensitivity, and strategic calculation about which fights can be won. Readers will form their own conclusions.
6 Key Ideas From This Book
More land is cleared for livestock grazing and feed crop production than for any other human activity — including the urban expansion and mining that receive far more environmental attention.
Producing one pound of beef requires approximately 1,800 gallons of water, 160 square feet of land, and generates 27 kg of CO₂ equivalent — making it among the most resource-intensive foods produced at scale.
Fertiliser runoff from feed crop production creates nutrient pollution in waterways, which drives algal blooms, depletes oxygen, and creates coastal dead zones inhospitable to marine life.
Shifting to a plant-based diet reduces an individual's food-related environmental footprint by more than any combination of other dietary changes — more than going local, organic, or seasonal alone.
The agricultural lobby is powerful, donor bases are sensitive, and dietary choice is politically fraught — creating institutional incentives to avoid confronting the environmental impact of meat consumption.
Pasture-raised, grass-fed, and regenerative animal products have lower intensity footprints — but the total land area required to raise global meat consumption this way exceeds available agricultural land many times over.
Any Weaknesses?
The book’s strongest critics argue that some of the statistics are selectively presented or drawn from contested sources — particularly the UN FAO figures on livestock emissions, which have been disputed. The argument also focuses heavily on beef and largely ignores the variation in footprint between different animal products and farming systems. The institutional silence narrative, while making valid points, sometimes veers into conspiracy territory.
Who Should Read This?
Readers who want to understand the environmental case for reducing meat consumption — particularly the land use and water arguments that receive less attention than carbon emissions.
The Omnivore's Dilemma for a more nuanced treatment of food systems, or How Not to Die for the health case alongside the environmental one.
Land use and agricultural policy analysts — the land efficiency argument for dietary change has significant implications for global food security and climate policy that mainstream policy discussion rarely addresses.
A polemical argument rather than a balanced analysis. The data is real, but the presentation is advocacy — read critically and verify key claims against peer-reviewed sources.
Frequently Asked Questions
Is The Sustainability Secret worth reading?
A provocative and important book that puts the environmental cost of animal agriculture on the table in terms that the mainstream environmental movement has often avoided. The core argument — that food choices are environmental choices, and that animal agriculture's footprint is larger than most people understand — is well-supported and urgently relevant.
Who should read The Sustainability Secret?
Readers who want to understand the environmental case for reducing meat consumption — particularly the land use and water arguments that receive less attention than carbon emissions.
What is The Sustainability Secret about in one sentence?
When Kip Andersen discovered that animal agriculture generates more greenhouse gases than the entire transport sector combined, he couldn't understand why major environmental organisations were barely discussing it.
The Verdict
A provocative and important book that puts the environmental cost of animal agriculture on the table in terms that the mainstream environmental movement has often avoided. The core argument — that food choices are environmental choices, and that animal agriculture's footprint is larger than most people understand — is well-supported and urgently relevant.
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