levels of nitrous oxide rose high enough to threaten the occupants with brain damage and had to be controlled by outside intervention . skyrocketed to levels that threatened to poison the human and spurred the growth of weedy vines that choked out food crops. Nutrients leached from the soil and polluted the water system
Tropical birds disappeared after the first freeze . An Arizona and species got into the enclosure,proliferated, and killed off all other soft-bodied insects. After the majority of the introduced insect species became extinct, the facility was overrun with cockroaches and katydids.