Calculates embodied land in trade using the domestic technology assumption.
Usage
domesticFootprintTrade(
gdx,
file = NULL,
level = "reg",
type = "net-trade",
productsAggr = TRUE,
maxIntensityRatio = 5
)Arguments
- gdx
GDX file
- file
a file name the output should be written to using write.magpie
- level
Level of regional aggregation; "reg", "glo", "regglo"
- type
"exports", "imports", or "net-trade" (default)
- productsAggr
Aggregation of primary products; default is TRUE
- maxIntensityRatio
Maximum allowed ratio of regional to historical (1995) land intensity. Regional land intensities exceeding this factor times the 1995 value are capped. This same value is used for filling NAs. Use NULL for no capping. Default is 5 (caps at 5× 1995 values).
Details
The domestic technology assumption values all traded goods using each region's own processing shares, feed baskets, and land intensity (yields). For exports this represents the actual land footprint. For imports this is a counterfactual: how much land would the region need if it produced its imports domestically?
Trade flows are decomposed into primary product equivalents via three pathways: (1) direct primary trade, (2) primaries embodied in secondary products, (3) primaries needed as livestock feed. Land intensity (ha/tDM) is then applied per primary product.
Regional land intensities are filled and capped using historical (1995) FAO yields as reference. This ensures comparability across different model runs while accounting for regional differences in agricultural potential.
This is a consistent approach with net trade data (no bilateral flows). With bilateral trade data, different basis for land intensity could be applied.