Positive relationships between diversity and ecosystem functions were found by experiments where diverstiy was lost and then restored. Ecologists believe that the loss of biodiversity threatens the stability of ecosystems. With an unstable ecosystems animals are unable to adapt to things such as climate and diet. The loss of biodiversity not only threatens animals, but to society as well. Farmers are experiencing a decrease in bees and other species that pollinate from parasities and disease - this is causing a descrease in product. Another example of loss of biodiversity is over fishing - humans fishing is causing such a drastic decrease in species that a ``global collapse`` is predicted to happen in the 21st century. (91, Easton)
