How many hotspots of biodiversity in the world have been identified till date by Norman Myers?

Explanation

Biodiversity hotspots are a method to identify those regions of the world where attention is needed to address biodiversity loss and to guide investments in conservation. The idea was first developed by Norman Myers in 1988 to identify tropical forests hotspots characterised both by exceptional levels of plant endemism and serious habitat loss which he then expanded to a more global scope. Currently, 34 biodiversity hotspots have been identified most of which occur in tropical forests.