Any natural or human-induced factor that directly or indirectly causes a change.
In the context of ecosystems:
A direct driver is a driver that unequivocally influences ecosystem processes and can therefore be identified and measured to differing degrees of accuracy. [Important direct drivers include habitat change, climate change, invasive alien species, overexploitation, and pollution.]
An indirect driver is a driver that operates by altering the level or rate of change of one or more direct drivers. [Important indirect drivers include changes in population, economic activity, and technology, as well as socio-political and cultural factors.]
Ecosystem change - Ecosystem(s)
Español: Generador de cambio (de los ecosistemas)
Français: Facteur de changement (dans un écosystème)
Nederlands: Aandrijver