How do they choose people for these surveys? And can 24k people from 32 countries (so, 750 in each) be representative of 8 billion in 200+ countries? I know only a minority locally who could support a plastics ban, due to low awareness.

Certainly a guesstimate in other countries I can think of who are likely responsible for high plastics pollution, would be far lower than 8 or 9 out of every 10 people, as it's a contributor as to why the issue exists in those places, surely?