environment   nature    ibidukikije
En-En dictionary 
improvement    (of soil) ukubungabunga
(isi)
(of environment) uguteza imbere ahantu, ukubungabunga ibidukikije
En-En dictionary 
ikidukikije (ibi-  4  class 4
singular: iki-,ic-
plural: ibi-,ivy-
  
1. nature, natural world, 2. environment, surrounding (usually used in pl., from gukīkiza)