Other Italian government ministers have also voiced their opposition at the act, with environment minister Sergio Costa branding it "unacceptable". Nicola Zingaretti, leader of Italy's Democratic Party, tweeted:
We strongly condemn this gesture from those who do not respect ideas they do not agree with.
The effigy appeared as Extinction Rebellion protests took place in Rome on Monday, urging the Italian government to do more to reverse the effects of global warming.
Thunberg has not yet addressed the effigy, but has shown her support towards the global XR protests emerging in numerous countries around the world.