All organisms influence their environments. Some influences are ameliorative, that is, they reduce stresses or hazards for the organism itself or for others of its species. Other influences may make a habitat more hostile to the organism.
Local extinction is a common outcome.
For non-human species, and even for some human groups, a spatial or temporal cycling through habitable environments may be seen as a natural and even a necessary process. For modern humans, it is an environmental crisis . Efforts to increase environmental utility or decrease environmental hazard are called environmental management . Certainly practitioners should have a thorough understanding of natural systems. You should already have a good background from the prerequisites for this course and from other courses you have taken.