Climate-smart agriculture
What climate-smart agriculture means, its three pillars, the practices behind it, how its results are measured, and the criticisms worth knowing.
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Agriculture is caught in both directions by climate change. Rising temperatures, shifting rainfall and more frequent extremes cut yields and threaten livelihoods, while farming, together with the land-use change it drives, is itself a major source of greenhouse gases. Climate-smart agriculture (CSA) is an approach that tries to deal with both at once, while still producing more food.
The term was introduced by FAO in 2010 and is now used in national climate plans, development programmes and university syllabi worldwide. It appears increasingly in essays and interviews for agricultural and civil-service examinations, which tend to ask for its pillars, examples, and a critical view.
Why agriculture and climate are linked
- Impacts on farming. The IPCC's Sixth Assessment Report (2022) concluded that climate change has already slowed the growth of agricultural productivity over the past fifty years, with the largest effects in warmer, lower-income regions, and that risks rise sharply with every additional increment of warming. Heat at flowering, drought, floods, new pest ranges and changing seasons all reduce yields and raise variability.
- Emissions from farming. Agriculture, forestry and other land use together account for roughly a fifth of global greenhouse gas emissions; counting the whole food system (processing, transport, packaging, waste) the share rises to about a third. Within the farm gate the largest sources are methane from cattle and other ruminants and from flooded rice, nitrous oxide from fertilised soils and manure, and carbon dioxide from clearing forests and draining peatlands.
- Food demand. Population and income growth mean more food is needed, so cutting production is not a solution.
The three pillars
FAO defines climate-smart agriculture as agriculture that pursues three objectives:
- Sustainably increasing agricultural productivity and incomes.
- Adapting and building resilience to climate change.
- Reducing and/or removing greenhouse gas emissions, where possible.
The wording "where possible" matters. For a smallholder in a low-emitting, food-insecure region, productivity and adaptation come first; mitigation is a co-benefit, not an obligation. For high-emitting, intensive systems, mitigation weighs more. CSA is described as an approach, not a fixed list of technologies: the right mix depends on the place.
The practices
For productivity and adaptation
- Stress-tolerant varieties: drought-, heat-, flood- and salt-tolerant crops, such as rice varieties that survive two weeks of submergence, and drought-tolerant maize.
- Water management: rainwater harvesting, supplementary irrigation, drip irrigation, better scheduling.
- Climate information services: seasonal forecasts and weather advisories delivered to farmers, so that sowing dates, varieties and inputs match the coming season.
- Diversification: of crops, livestock and income sources, reducing the risk of total loss.
- Risk transfer: index-based (parametric) crop and livestock insurance, which pays out on rainfall or satellite triggers.
For mitigation, often with productivity gains
- Nitrogen efficiency: the right source, rate, time and place of fertiliser, cutting nitrous oxide and costs.
- Rice water management: alternate wetting and drying, which can cut methane substantially while saving water.
- Livestock: better feed quality and animal health raise output per animal, lowering emissions per litre of milk or kilogram of meat; feed additives that reduce enteric methane are emerging.
- Manure management: covering stores, anaerobic digestion, timely application.
- Reducing food loss and waste, which avoids the emissions of producing food that is never eaten.
- Avoiding deforestation and protecting peatlands, by far the largest mitigation opportunity linked to agriculture.
Often serving all three
- Agroforestry: trees store carbon, shelter crops and diversify income.
- Conservation agriculture: minimum tillage, permanent soil cover and rotations, conserving water and soil and, in some conditions, soil carbon.
- Integrated soil fertility management and building soil organic matter.
- Improved grazing management and restoring degraded pastures.
Measuring results: intensity versus absolute emissions
Because CSA seeks more output and fewer emissions at once, its results are often expressed as emission intensity, emissions per unit of product, alongside absolute emissions per hectare or per farm.
When emissions per tonne fall but total emissions rise
A maize farm yields 3.0 t/ha and its fertiliser and field operations emit the equivalent of 2.4 t CO2 per hectare. After improved varieties and better-timed fertiliser, it yields 4.0 t/ha and emits 2.6 t CO2e per hectare.
- Before: intensity = 2.4 ⁄ 3.0 = 0.80 t CO2e per tonne of grain.
- After: intensity = 2.6 ⁄ 4.0 = 0.65 t CO2e per tonne, a fall of about 19 per cent.
- But absolute emissions per hectare rose by (2.6 − 2.4) ⁄ 2.4 ≈ 8 per cent.
Is this climate-smart? If the extra tonne per hectare means less forest is cleared elsewhere to grow the same food, yes, strongly. If total production simply grows, total emissions rise. This is why CSA assessments look at both measures, and at land use beyond the farm.
Monitoring, reporting and verification (MRV) of agricultural emissions uses the IPCC Guidelines for National Greenhouse Gas Inventories, with default emission factors (Tier 1) or country- and farm-specific data (Tiers 2 and 3).
Policy and finance
Most countries' nationally determined contributions under the Paris Agreement include agriculture, mostly for adaptation. International programmes and climate funds finance CSA projects, and carbon markets offer payments for some practices, such as agroforestry and soil carbon, though with real questions about measurement and permanence. Agriculture has gained a growing place in the UN climate negotiations, including a dedicated work programme on agriculture and food security.
Criticisms worth knowing
A balanced answer includes the debate:
- Vagueness: almost any practice can be labelled climate-smart, so the term can be used to rebrand business as usual, or to promote particular products, without evidence of benefit.
- Trade-offs: a practice may raise yields while raising emissions, or cut emissions while costing farmers income. "Triple wins" are not guaranteed and must be measured locally.
- Who bears the burden: critics argue that mitigation expectations should fall mainly on high-emitting systems and countries, not on smallholders with tiny footprints.
- Agroecology versus technology: some argue that CSA favours technological fixes over deeper changes in farming systems and diets; others see the approaches as complementary.
- Measurement: soil carbon in particular is slow to change, variable and reversible, making claims hard to verify.
Key points
- Climate-smart agriculture (FAO, 2010) pursues three goals: higher productivity and incomes, adaptation and resilience, and lower or removed emissions where possible.
- Agriculture and land use cause roughly a fifth of global emissions (food systems about a third); methane and nitrous oxide dominate within the farm gate, and deforestation outside it.
- Practices include stress-tolerant varieties, water harvesting, climate information, insurance, nitrogen efficiency, alternate wetting and drying, better livestock feeding, agroforestry and conservation agriculture.
- It is an approach, not a list: practices are climate-smart only in context.
- Results should be judged by both emission intensity and absolute emissions, including effects on land use.
- Criticisms: vagueness, trade-offs, burden on smallholders, and difficult measurement.
What the exams ask
- Agricultural university and research-fellowship entrances: the definition and three pillars, examples of practices for each, and agriculture's sources of greenhouse gases.
- Civil-service and policy examinations: essays on climate change and food security, adaptation strategies for farmers, the role of agriculture in national climate commitments, and critical assessment of CSA.
- Professional and postgraduate examinations in sustainability and agronomy: emission intensity calculations, MRV, carbon markets for agriculture, and choosing context-specific practices.
Described in general terms: the kind of examination, not a past paper. Laisha never reproduces exam questions.
Questions people ask
Is climate-smart agriculture the same as organic farming?
No. Organic farming is defined by rules on inputs and certification. CSA is defined by outcomes: productivity, resilience and emissions. Some organic practices are climate-smart in some contexts; some conventional practices, such as precise fertiliser use, are too.
Can smallholder farmers afford it?
Many practices cost little (better timing, water harvesting, diversification), while others need investment or credit. Programmes that combine practices with information, insurance and finance have had the most uptake.
Does planting trees on farms solve agriculture's emissions?
It helps, by storing carbon and diversifying income, but it does not cancel methane and nitrous oxide emissions, and stored carbon can be lost if trees are cut. It is one part of a wider set of measures.
Sources
- FAO. "Climate-Smart" Agriculture: Policies, Practices and Financing for Food Security, Adaptation and Mitigation. Food and Agriculture Organization of the United Nations, 2010.
- FAO. Climate-Smart Agriculture Sourcebook, 2nd edition. FAO, 2017 (online).
- IPCC. Climate Change 2022: Impacts, Adaptation and Vulnerability, Working Group II, Chapter 5 (Food, fibre and other ecosystem products). Cambridge University Press, 2022.
- IPCC. Climate Change 2022: Mitigation of Climate Change, Working Group III, Chapter 7 (AFOLU). Cambridge University Press, 2022.
- Crippa, M. et al. "Food systems are responsible for a third of global anthropogenic GHG emissions." Nature Food 2, 198–209 (2021).
- Lipper, L. et al. "Climate-smart agriculture for food security." Nature Climate Change 4, 1068–1072 (2014).
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