Description of data and code

Public data
Climate data is accessible from:
Historical period:https://worldclim.org/data/worldclim21.html
Future projections: https://worldclim.org/data/cmip6/cmip6climate.html

Ecoregion data is available from:
Freshwater: https://www.feow.org/download
Terrestrial: https://www.worldwildlife.org/publications/terrestrial-ecoregions-of-the-world

All scripts used in this publication were coded under R version 4.3.0 (2023-04-21 ucrt)

File "1_Climate_data.R" loads and wrangles climate data extracting climate data from each ecoregion and computing the global variance used in climate matching.

File "2_Climate_matching.R" loads extracted climate data and runs all the climate matches in parallel across 7 cores as written (runs in ~65 hours; Intel i7-9700K @ 3.6 GHz 8 core processor). Averages matches across GCMs for each shared-socioeconomic pathway. For climate matching a local package developed by article authors was used. See the "Euclimatch" R package published on CRAN after the acceptance of the related article for the same climate-matching functionality.

File "3_Statistical_analyses.R" Conducts statistical analysis and produces Figures 1 and 2 for and Supplemental Information Tables S1-4.

File "4_Maps.R" Produces Figures 3 and 4 for and Supplemental Information Figure S1.

File "5_Circular_plots.R" Produces Figure 5.

Naming convention to identify climate match datasets

Each data set is in an R format (.Rda) because they are so large. These can be loaded into R with the `load()` function.
Climatch data sets are dataframes of pairwise climatch scores (see methods in the article) between all possible pairs of ecoregions of each set (freshwater and terrestrial). Climatch scores were calculated for each ecoregion as a source and as a recipient.

Each dataset begins with "climatch" and contains the following:

GCM codes corresponding to each GCM run:
"ens" = Ensemble (average) of all GCMs of a given scenario (e.g. SSP5-8.5)
"BC" = BCC-CSM2-MR
"ESM2" = CNRM-ESM2-1
"CAN" = CanESM5
"CM6A" = IPSL-CM6A-LR
"MIRES2" = "MIROC-ES2L
"MRI" = MRI-ESM2-0

Climate scenarios, all projections under 2081-2100 (2090):
"hist" = The historical period (1981-2000)
"245" = SSP2-4.5
"370" = SSP3-7.0
"585" = SSP5-8.5

Ecoregion set:
"feow" = Freshwater ecoregions of the world
"teow" = Terrestrial ecoregions of the world

End