** The World Commission on Environment definition of sustainability: A sustainable society is one that "meets the needs of the present without compromising the ability of future generations to meet their own needs
** Tume ya Dunia ya Mazingira ufafanuzi wa uendelevu: jamii endelevu ni ile "inaweza kukidhi mahitaji ya sasa bila tuhuma kwa uwezo wa vizazi vijavyo kukidhi mahitaji yao wenyewe.