KM-A2 Invasive alien species cause dramatic and, 
in some cases, irreversible changes to biodiversity 
and ecosystems, resulting in adverse and complex 
outcomes across all regions of Earth, including 
local and global species extinctions {A2, A3} 
(Figure SPM.3). Invasive alien species have contributed 
solely or alongside other drivers to 60 per cent of recorded 
SUMMARY FOR POLICYMAKERS
The thematic assessment report on
INVASIVE ALIEN SPECIES
AND THEIR CONTROL
KM-A1 People and nature are threatened by 
invasive alien species in all regions of Earth 