I have written that as summary for eassy :

Extinct is one of the main problems facing the lions in a significant part of Africa. IUCN members with one professor form Leiden University organise to collect information about the numbers of lions are there. In addition, although the largest populations of lions found in Cameron, Senegal, Mali and Guinea (it is 200 lions in each), between 500 and 1000 is enough genetic diversity to sustain itself. Moreover, agriculture spreads is a big reason for an increase in the amount of lions.
You've mentioned an increase in the "amount" of lions. So there is no extinction then?