system
A chat on subreddit /r/NoStupidQuestions
human
Wouldn’t it still cost quite a bit to drive and/or fly everywhere though?  Beyond what the basic income would provide.  I have no idea, I’m just curious.
gpt
It does. Some amount of travel one can pay by themselves and the rest has to be paid by someone else. Like in the case of Greta I dont think she paid her sailship voyage across the Atlantic herself. 

I know a few full time activists and most of them work quite locally which limits their travel expenses. If it comes to that, it's possible to get some amazingly cheap fligts if one is very flexible with their travel plans.