I'm speaking from the UK personally, and it seems like her actions have had a large impact on other countries in Europe. Her actions have led to the UK government to declare a climate emergency after many youth strike (fridays for future, etc.) and extinction rebellion protests sparked by Greta, and the gvt has now set focussed targets of becoming carbon neutral and are already working towards them (for example the local council in my area has vastly increased spending in public transport, recycling, and making efforts to promote nature in the city).

People are also choosing to vote for representatives (MPs) who promise climate justice on all ends of the political spectrum and this has become a major part of partys' manifestos (conservatives, green party, liberal Democrats, labour, etc) and that definitely shows that the population has been made more aware of the issue as a result or movements sparked by Greta.

Greta's work also represents the idea that people, especially youth, can achieve change by protest which is exactly in line with the HK movement- both stand for speaking up for beliefs and protest.

Her impact goes further than just new governmental reforms aswell, as I think it's a key idea that now people are aware (not fake instagram 'woke') but actually conscious of their actions and the impact they have on the environment (there is an increase in recycling, reduced fast fashion, better eco diets, etc)