 Greve holds the Ordine al Merito della Repubblica Italiana (Cavaliere Ufficiale), which he received in December 1998.Karsten Greve supports the Jewish National Fund (קרן קימת לישראל, "Keren Kayemet LeYisrael") in its environmental efforts and afforestation project.In 2013 he made a donation of 1 Mio.