Carbon Sustainability Index (CSI) — carbon_sustainability

Ratio of yield to net carbon emission, accounting for carbon sequestration by the soil.

carbon_sustainability_index(
  yield,
  carbon_emission,
  carbon_sequestered = 0,
  verbose = TRUE
)

Arguments

yield: Numeric vector. Crop yield (kg/ha).
carbon_emission: Numeric vector. Total GHG emission (kg CO2-eq/ha).
carbon_sequestered: Numeric vector. Carbon sequestered in soil (kg CO2-eq/ha). Default 0.
verbose: Logical. If TRUE, prints informational messages. Default TRUE.

Value

Numeric vector. Carbon sustainability index. Higher values indicate better carbon sustainability. Returns NA where net emission is zero or negative (net sequestration exceeds emission).

Details

Formula: $$CSI = \frac{Yield}{Carbon Footprint}$$

References

Brentrup, F. et al. (2004). Environmental impact assessment of agricultural production systems using the life cycle assessment methodology. European Journal of Agronomy, 20(3), 247-264. doi:10.1016/S1161-0301(03)00024-8

Examples

carbon_sustainability_index(yield = 4500, carbon_emission = 2500,
                             carbon_sequestered = 500)
#> CSI computed.
#> [1] 2.25