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.
One threat to these Savanna biomes is the animals which graze upon it. Other biomes such as Taiga or Rainforest have a high tree quantity which means that less grass is able to grow for animals to graze on. However, since Savannas have few trees and much wide open space than other biomes an herbaceous layer grows much easier.
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.