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Calculate enteric methane emissions.

Source: R/livestock_emissions.R
calculate_enteric_ch4.Rd

Wrapper that selects Tier 1 or 2 for enteric CH4 based on data availability.

Usage

calculate_enteric_ch4(data, tier = NULL)

Arguments

data

Dataframe with species, heads. For Tier 2, also needs cohort, weight, and diet_quality. For Tier 1, iso3 is used to select regional emission factors.

tier

Integer 1 or 2. If NULL (default), auto-selects based on data completeness.

Value

Dataframe with all input columns preserved, plus:

  • method_enteric: tracking label ("IPCC_2019_Tier1" or "IPCC_2019_Tier2").

  • Tier 1: enteric_ef_kgch4 (emission factor), enteric_ch4_tier1 (total kg CH4).

  • Tier 2: gross_energy, ym_factor, enteric_ch4_per_head (kg CH4/head/yr), enteric_ch4_tier2 (total kg CH4).

Examples

tibble::tibble(
  species = "Cattle", heads = 1000, iso3 = "DEU"
) |>
  calculate_enteric_ch4(tier = 1)
#> # A tibble: 1 × 7
#>   species heads iso3  species_gen method_enteric  enteric_ef_kgch4
#>   <chr>   <dbl> <chr> <chr>       <chr>                      <dbl>
#> 1 Cattle   1000 DEU   Cattle      IPCC_2019_Tier1               47
#> # ℹ 1 more variable: enteric_ch4_tier1 <dbl>