Final answer:
The exact percentage of land covered by Mediterranean scrub forests isn't provided, but these areas are characterized by temperate, semi-arid climates, with shrub-dominated vegetation adapted to periodic fires. They are under threat and inadequately protected.
Step-by-step explanation:
The percentage of land covered by Mediterranean scrub forest, often known as chaparral, isn't specified in absolute figures within the provided references. However, we can glean that these regions are characterized by a temperate, semi-arid climate, with vegetation mostly composed of shrubs adapted to survive periodic fires. It's noted that the ashes from these fires bring essential nutrients such as nitrogen to the soil which encourage the regrowth of plants. There is evidence to suggest that the area of such scrublands is under threat, with some Mediterranean scrublands poorly covered by protected areas and steppe habitats, river valleys, and Mediterranean scrublands being of particular concern.