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 to rainforest ecosystemsAs we have seen previously, rainforests are subjected to a range of natural disturbances, mainly due to cyclones and storm damage, but also drought, fire and volcanic eruptions are other natural processes that effect rainforest ecology.asically humans are the biggest threat. ---------------------------------------------------------------------------------------------------- Extended Periods of Drought is a serious threat to rainforests today. 8 people found this useful.