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.
Threats. Overgrazing by livestock and plowing are the two greatest threats to temperate grasslands. Since the development of the steel plow much of these grasslands have been converted to agricultural lands because of their rich soil.About 47 percent of temperate grasslands have been converted to agriculture or urban development.he major temperate grasslands include the veldts of Africa, the pampas of South America, the steppes of Eurasia, and the plains of North America.