Q&A: Nearly 25% of land in Africa has been damaged—what's to blame, and what can be done

Land degradation is a huge issue across the continent of Africa. One of its biggest drivers is biological invasions. This is when invasive species (species that aren't naturally found in the area) arrive and produce large numbers of offspring which spread over long distances. Mlungele Nsikani, a land restoration specialist and environmental scientist, explains how ecological restoration is a great way to reverse land degradation.