Unfortunately this unique vegetation zone has been seriously threatened both by fire and introduced plants. (galapagos.org)
About one - third of the Sahel was projected to aridify with warming of 1.5 to 2 °C by about 2050, with a general equatorward shift of vegetation zones (van den Born et al., 2004; Box 4.2). (ipcc.ch)
«If trees have access to a larger volume of soil, this promotes more wooded vegetation whereas shallower rooting, lower precipitation and fire promote less wooded, grass dominated vegetation zones. (senckenberg.de)