After the boom-bust-boom of the fifties and sixties, the borough went into a third and more severe decline again in the mid-1970s along with much of the Rust Belt so that population was just 2,804 at the 2000 census. Now in the 2011 Brownsville still has a handful of buildings condemened or just borded up.
Threats to Biodiversity. The primary threats to the savanna biome are humans (for example, poachers are killing elephants for their ivory tusks and hunting animals to the brink of extinction) and global climate change.
The savanna is home to large herds of grazing animals and the predators that follow them. It is a carefully balanced ecosystem that can easily be disturbed by changes in climate, an imbalance in the number and type of animal species, and human influences such as farming and cattle herding.