Environmental Impacts of Food Production and Consumption Notes

Emphasizes the connection between food choices, production methods, human health, and planetary health (UN, 2023).
Importance of sustainable food practices to achieve responsible consumption and production goals.

The food supply chain spans several nodes:
- Production of inputs (fertilizers, seeds)
- Farming practices
- Transportation and distribution
- Retail and household consumption
Each step in the supply chain contributes to environmental degradation and greenhouse gas emissions.

Food production is responsible for approximately 30% of global greenhouse gas emissions (GHGs).
Contributes to climate change through:
- Land use changes
- Transportation of goods
- Energy used in food processing and refrigeration
Animal-based foods generally have a higher GHG footprint compared to plant-based foods.
- Example:
- Lamb and cheese: > 20 kg CO₂-equivalents/kg
- Poultry and pork: ~6-7 kg CO₂-equivalents/kg

Carbon Dioxide (CO₂): Emitted from fossil fuels and deforestation.
Methane (CH₄): Primarily from livestock and manure management.
Nitrous Oxide (N₂O): Emitted from agricultural soils, particularly with fertilizer use.
Other greenhouse gases include hydrofluorocarbons (HFCs) and perfluorocarbons (PFCs).

Agriculture uses 40% of the Earth's land surface.
Animal-based foods have larger land footprints due to extensive grazing and feed production needs:
- Beef and lamb: Largest land requirements.
- Poultry and pork: Require less land compared to beef and lamb.
Plant-based foods:
- Fruits and vegetables: Smaller land footprints when grown in efficient systems.
- Grains: Moderate land usage; nuts and legumes vary based on climate.

Defined as excessive nutrient enrichment in water bodies, primarily from agricultural runoff.
Key contributors:
- Excess nitrogen and phosphorus from fertilizer runoff.
- Livestock manure entering water systems.
- Poor aquaculture practices.
Consequences:
- Algal blooms deplete oxygen in water, creating dead zones detrimental to aquatic life.
- Disrupts aquatic ecosystems and can lead to economic impacts on fishing and tourism.
Management strategies to combat eutrophication:
- Improved agricultural practices.
- Control of nutrient runoff.
- Lower usage of nitrogen and phosphorus fertilizers.

CO₂ dissolves in ocean water and transforms into carbonic acid, which increases acidity.
Impacts marine ecosystems, especially organisms needing calcium carbonate (shells, skeletons).
Threatens seafood availability, impacting food security for vulnerable populations.
Mitigation strategies include:
- Reducing CO₂ emissions through sustainable practices.
- Supporting resilient aquaculture and fisheries.

Water footprint varies significantly by type of food:
- High Water Use: Almonds and pistachios require extensive irrigation.
- Moderate Water Use: Grains, legumes, and certain fruits and vegetables.
Importance of understanding regional water availability to assess sustainability of agricultural practices.

Food systems contribute to climate change through:
- Greenhouse gas emissions.
- Land and water resource depletion.
- Pollution from fertilizers.
Sustainable practices are critical to mitigating environmental impacts.
Shift toward plant-based diets can lower individual carbon footprints significantly.

Understanding the environmental impacts of food production and consumption is crucial for making informed decisions that benefit both individual health and the health of the planet.
Adoption of sustainable consumption practices is vital in addressing the challenges posed by global food systems.