Not as many tigers can survive in small, scattered islands of habitat, this leads to a higher risk of inbreeding and makes tigers more vulnerable to poaching as they venture beyond protected areas to establish their territories.
Hope this helps a bit. :)
Glaciers can effect the environment in a negative way, it can cause mass flooding due to global warming.
In general, "America
changed to an urban society" is a reason why the factory system developed in the United States. Another was a greater demand for textiles.
