There's not really too much science that plays into the film unless you want to point how Scar threw off the balance of the food chain (mainly referred as the Circle of Life). There should always be a small population of predators that consume the first-level and/or second-level consumers. When there is a maximum of apex predators, the population of prey drastically decreases, which leaves the primary producers (autotrophs like trees, grass, and other vegetation) unchecked.
In the film, yes, Scar let the hyenas overhunt therefore the land suffered from overconsumption. It is possible a natural drought broke out during his reign in which he had no control of. As well, the Fisher King myth (the spiritual aspect everyone is mention) is applied in the film by which the condition of the kingdom is dependent on the goodness or evilness of those in power.
gothprincesskiara wrote:Scar and the hyenas, take over the pridelands, Scar lets the hyenas over hunt the land the land dies, BUT if the the herds were over hunted and or have moved on, WOULDN'T there be more vegetation since there was nothing to grazwe it, wouldn't it, shouldn't it have the OPPOSITE effect?
There would be a surplus of vegetation, which is not a good thing. If there aren't any grazing animals around to keep in check, they would experience overgrowth, and coupled with a lack of rainfall, the vegetation would dry out and die.