Overgrazing, soil depletion, drought, and floods persist as problems for the future.

FORBES: Swaziland

They say it is to protect the wildlife -- which is also a major source of income from hunting and safaris -- from Maasai cattle overgrazing the land.

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The findings, based on data from 80 Sites of Special Scientific Interest (SSSIs), also warned that the impact of overgrazing by deer had a knock-on effect that undermined woodland ecologies.

BBC: Roe deer numbers 'changing woodland ecosystems'

Tourism is creating other problems for the local environment, too, including increased population density, over-dependence on wood as a fuel and construction source and the overgrazing and cutting of mountain slopes to feed livestock.

BBC: Everest's growing problem

Soon, hunting and overgrazing decimated native prey populations.

CNN: Mexican wolf prevails in court