Climate-Food Systems Overview

Overview

Climate change presents severe threats to global food security and nutrition through extreme weather, reduced crop yields, and declining nutritional quality. Urgent integrated action combining mitigation and adaptation is essential to protect vulnerable populations and achieve sustainable development goals by 2030.

Climate Change Impacts on Food Production

• IPCC confirms climate change has already reduced food and water security through more frequent and intense extreme events.
• High-confidence adverse impacts observed in Africa, Australasia, small islands, Arctic regions, urban areas, and Mediterranean.
• Future projections show worsening conditions: increased malnutrition risk, micronutrient deficiencies, and livelihood losses.
• Global surface temperature rise above 1.5°C triggers transition from moderate to very high risk for food systems.
• Latest AgMIP research reveals more negative and earlier negative effects on crop yields than previously projected.
• Maize production particularly vulnerable; projections show yields declining sooner than historical variability suggests.

Effects on Nutritional Quality

• Climate change alone decreases crop calorie production; elevated CO2 partially restores calories but reduces micronutrient quality.
• Combined climate and CO2 effects create critical trade-off between food quantity and nutritional value.
• Crops grown under high CO2 conditions show decreased concentrations of essential vitamins and minerals.
• Micronutrient deficiencies pose serious health risks for populations already experiencing malnutrition.

Multiple Cascading Crises

• Food systems face concurrent challenges: climate change, COVID-19 pandemic effects, and conflict-related disruptions.
• Ukraine conflict disrupted global grain supplies and increased fertilizer prices by 30-40 percent.
• Supply chain interruptions affect food availability, access, and stability across all regions.
• Development pathways must integrate responses to all three crises simultaneously for effective solutions.

Regional Impacts and Vulnerabilities

• Low and middle-income countries have significantly lower adaptive capacity than OECD nations.
• Africa faces simultaneous droughts, floods, and climate variability within single seasons.
• Europe experiencing 10-20 percent crop production declines despite decades of emission reduction efforts.

Systemic Food System Disruptions

• Climate change affects entire food system beyond agricultural production alone.
• Food storage, processing, packaging, and retail operations face heat wave and flood disruptions.
• Informal food environments critical for poor populations are particularly vulnerable to climate shocks.
• Supply chain disruptions affect food consumption patterns, stability, and household access.

Livestock Production Challenges

• Heat waves cause estimated $40 billion annual livestock production losses globally.
• Low and middle-income countries experience disproportionate livestock productivity declines (approximately 10 percent value loss).
• Livestock remain critical protein and nutrient sources plus essential assets for poor households.
• Improved management can reduce emissions while maintaining or increasing productivity.

Greenhouse Gas Emissions from Food Systems

• Food systems responsible for 21-37 percent of total anthropogenic greenhouse gas emissions.
• Land use change and agricultural production dominate emission sources across all regions.
• Industrialized countries show higher energy-related emissions from refrigeration, processing, and formal market infrastructure.
• Demand patterns and dietary choices significantly influence land use and overall emission levels.

Dietary Transitions and Sustainability

• Current diets show widespread over-consumption of red meat and starchy vegetables in many regions.
• Global under-consumption of vegetables, fruits, legumes, and whole grains across all regions.
• Shifting toward recommended diets offers dual benefits for health improvement and emission reduction.
• Increased production and market access for nutrient-dense foods remains critical research gap.

Adaptation Strategies and Solutions

• Packages combining multiple interventions more effective than single "silver bullet" approaches.
• Improved food supply chains, reduced food waste, and enhanced storage infrastructure offer immediate benefits.
• Shortened supply chains and improved transport distribution reduce both emissions and losses.
• Urban and peri-urban agriculture provides local food access with lower environmental footprint.
• Climate-smart agriculture techniques increase resilience while reducing emissions intensity.

Mitigation Options for Food Systems

• Livestock system improvements through circularity: using food waste and crop by-products as feed.
• Potential to produce 23 grams protein per person daily (40 percent adult requirements) from food waste.
• Increased productivity with reduced animal numbers creates environmental gains across land, water, and resource use.
• Decoupling livestock production from arable land competition reduces opportunity costs.

Policy and Governance Measures

• Supply-side policies: increased funding for infrastructure, technology transfer, and research investment.
• Demand-side interventions: awareness campaigns, education programs, food labeling standards, and subsidy reform.
• Repurposing existing agricultural subsidies toward sustainable practices offers significant funding source.
• Accountability frameworks with clear metrics and protocols essential for tracking progress.

Research and Collaboration Priorities

• AgMIP (Agricultural Model Intercomparison and Improvement Project) coordinates global network of 1,000+ researchers.
• Multi-model approaches provide more rigorous projections than single-model studies.
• National and sub-national coordination helps prioritize limited adaptation resources effectively.
• Development pathway approach integrates agricultural development with sustainability goals.
• Protocols enable study replication and cross-regional comparison of results.

Transboundary and Scaling Considerations

• Research must address both place-based interventions and regional/global supply chain effects.
• Transboundary adaptation science emerging as critical field for understanding cross-border impacts.
• Scalability must be built into pilot project design from inception.
• Success stories and case studies needed across diverse farming systems and contexts.

Integration of Mitigation and Adaptation

• Mitigation and adaptation must not remain siloed; require simultaneous consideration in all interventions.
• AgMIP developing integrated models incorporating emissions and climate change scenarios together.
• Bangladesh serving as pilot study for mitigation-adaptation co-benefits protocol development.
• Every intervention should contribute to both reducing emissions and building resilience.

GAIN's Climate and Nutrition Response

• Internal focus: making all programs climate-sensitive for mitigation and adaptation.
• Pakistan dairy project example: converting 10,000 liters daily whey waste into affordable nutritious drinks.
• Working across 13 African and South Asian countries to increase access to healthy, safe, nutritious foods.
• Value chain interventions connect production to consumption while minimizing environmental impact.

Advocacy and COP27 Priorities

• COP27 in Egypt designated as "food COP" given agriculture's one-third share of global emissions.
• Climate change cannot be solved without addressing food system emissions and impacts.
• Translating complex science into investible, context-specific packages remains key challenge.
• Pre-COP diplomatic work essential; language in declarations and monetary commitments must be finalized beforehand.
• Nutrition and climate communities must partner to amplify advocacy impact.

Financing and Resource Mobilization

• Climate finance for low and middle-income countries must be dramatically increased.
• Green Climate Fund and similar mechanisms need greater operational agility for fund disbursement.
• COVID-19 pandemic raised $40 billion in three months; similar urgency needed for climate action.
• Every project should allocate research funding to embed learning, flexibility, and scaling strategies.

Key Terms and Definitions

• Burning Embers Diagram: IPCC visualization showing risk levels at different global temperature increases.
• CO2 Fertilization Effect: Enhanced plant growth from elevated atmospheric carbon dioxide that improves yields but reduces nutritional quality.
• AgMIP: Agricultural Model Intercomparison and Improvement Project; global network advancing crop modeling and climate impact assessment.
• Representative Dietary Pathways: Frameworks projecting how dietary patterns affect climate and nutrition outcomes.
• Circularity: Closed-loop systems using waste products as inputs, such as feeding food waste to livestock.

Action Items and Next Steps

• Embed researchers in all climate-food projects to ensure learning, adaptation, and scalability.
• Develop comprehensive success case studies across diverse farming systems for replication and investment attraction.
• Create integrated mitigation-adaptation protocols with clear metrics for accountability.
• Strengthen partnerships between nutrition and climate communities for unified advocacy.
• Secure concrete financial commitments and declaration language before COP27.
• Prioritize research on climate impacts to nutrient-dense crops (vegetables, fruits, legumes, whole grains).
• Expand AgMIP adaptation teams to additional countries for national and sub-national planning support.