1) Desolation 1) Environmental condition 
• (n.) The act of depopulating, or condition of being depopulated; destruction or explusion of inhabitants.
<veterinary> Humane destruction of all animals on a premises during a disease eradication program. Used primarily in national programs established to eradicate newly introduced diseases (e.g., foot-and-mouth disease) that pose serious economic threats to the livestock industries. ... (05 Mar 2000) ... 
De·pop`u·la'tion noun [ Latin depopulatio pillaging: confer French dépopulation depopulation.] The act of depopulating, or condition of being depopulated; destruction or explusion of inhabitants. « The desolation and depopulation [ of St.Quentin] were now complete.» ...
[n] - the condition of having reduced numbers of inhabitants (or no inhabitants at all)
depopulation The condition of having reduced numbers of inhabitants or resulting in no inhabitants at all.
noun the condition of having reduced numbers of inhabitants (or no inhabitants at all)