 Domestic risks within the borders of specific countries may include increased crime rates, and political instability.Environmental degradation, partly due to the impact of recreational diving on the environment, where pollution and direct damage by divers have been recorded, and the effects of natural disasters and climate change such as increased water temperature causing coral bleaching are threatening the industry, as divers are less inclined to visit areas where these problems have been reported.Overexploitation by fishing and illegal extraction have led to some sites being closed and permit systems introduced, sometimes limiting the numbers of divers that may visit an area in a given time interval.