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.
abiotic factors. There are only a couple abiotic factors in the savanna that you can really recognize. One is fire. Fire is the most important abiotic factor to the savanna. without the constant fires a tropical savanna could turn into a tropical forest!Another abiotic factor is soil.There really isn't much to say about the soil except that it is real important to plants and the animals that eat the plants. Air and water are the two last abiotic factors in the savanna. Everybody knows the importance of air to any biome.nother abiotic factor is soil. There really isn't much to say about the soil except that it is real important to plants and the animals that eat the plants Air and water are the two last abiotic factors in the savanna.