```r
## Set a low resolution for demo purposes.
library(raster)
worldclim_prec<-getData(name = "worldclim", var = "prec", res = 10)
worldclim_tmin<-getData(name = "worldclim", var = "tmin", res = 10)
worldclim_tmax<-getData(name = "worldclim", var = "tmax", res = 10)
worldclim_bio<-getData(name = "worldclim", var = "bio", res = 10)
worldclim_alt<-getData(name = "worldclim", var = "alt", res = 10)
```