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.
Ecological Impacts. One of the single largest threats to our nation's natural resources, invasive species: Decrease biodiversity. Put endangered and threatened species at further risk. In fact, invasive species are the second leading cause of animal population decline and extinction worldwide. Displace native plants that wildlife and fish depend on for food. Increase soil erosion and can cause major damage to streams and other wetland areas that provide habitat for native fish, plants, and animals.