I've downloaded geo .tif files (https://chelsa-climate.org/downloads/). Specifically, I am using the Version2.1/Climatologies/1981-2010/bio files. However, the files have much finer resolution than I require. Is there a simple way to reduce the resolution of these in R? I want to reduce them by a specified factor, ex. aggregation factor of 12. Can I just resample the files to reduce the number of rows/columns?