Country borders: https://www.naturalearthdata.com/downloads/50m-cultural-vectors/50m-admin-0-countries-2/

Rainfall data: http://geoportal.org >> UNEP download service http://geodata.grid.unep.ch/

GLOBCOVER: http://due.esrin.esa.int/page_globcover.php

Country borders and provinces: https://ec.europa.eu/eurostat/web/gisco/geodata/reference-data/administrative-units-statistical-units/countries

Rivers and farms: vectors from Open Streetmap

Mean annual temperatures from WorldClim database rasters (see http://www.worldclim.org/): raster was randomly sampled at point positions and temperatures converted to °Celsius

DEM from EarthExplorer web portal (see PDF on how to download Geodata) - dataset description at link below
https://www.usgs.gov/centers/eros/science/usgs-eros-archive-digital-elevation-global-30-arc-second-elevation-gtopo30

