AFAIK, in the osm-carto style there is no generalization on live data for
performance reasons (because of continuous data updates via minutely
diffs). There are some precomputed / extracted data files though, some of
which contain generalized (simplified) data. These are all "external"
sources:




   1. world_bnd_m.shp, places.shp, world_boundaries_m.shp
   
<https://planet.openstreetmap.org/historical-shapefiles/world_boundaries-spherical.tgz>
   2. simplified_land_polygons.shp
   
<http://data.openstreetmapdata.com/simplified-land-polygons-complete-3857.zip>
   (updated daily)
   3. ne_110m_admin_0_boundary_lines_land.shp
   
<http://www.naturalearthdata.com/http//www.naturalearthdata.com/download/110m/cultural/ne_110m_admin_0_boundary_lines_land.zip>
   4. land_polygons.shp
   <http://data.openstreetmapdata.com/land-polygons-split-3857.zip>
   (updated daily)
   5. icesheet_polygons.shp
   <http://data.openstreetmapdata.com/antarctica-icesheet-polygons-3857.zip>
   6. icesheet_outlines.shp
   <http://data.openstreetmapdata.com/antarctica-icesheet-outlines-3857.zip>





still AFAIK, 1 and 3 are currently still from natural earth data, the rest
is from OSM, 2 is a simplfied version of 4, both come from
openstreetmapdata.org (Christoph and Jochen). Of these, 1-3 are containing
generalized data.

Cheers,
Martin
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