How safe does protected status keep the world's national parks?

Protected areas and habitats are being downgraded and delisted so often, to accommodate mining, logging or population growth, the problem even has its own acronym. Environment 360 reports

It's the saddest truism in wildlife conservation: When politicians announce that they are setting aside precious habitat "in perpetuity", what they really mean is until somebody else wants the land.

Protected areas now get reopened so often under the pressure of population and economic growth that the trend has spawned an acronym, PADDD, for "protected area downgrading, downsizing, and degazettement." There's also a web site, PADDDtracker.org, jointly maintained by the World Wildlife Fund (WWF) and Conservation International.