Maybe all, maybe some, maybe none. You may note that the article referred to exactly 10 Vancouver area students, and that none of them provided any opinion in the article. It’s almost as if there is zero connection between this article and Greta Thunberg.
Additionally, how many months before Thunberg”s appearance do you suppose the parents have to book and pay for the trip? Do you suppose the students might have learned new information about the causes of climate change between the booking and now?
Yes, you're right, there is no connection between this story and Thunberg save for the one that I made. These kids, and their parents would know all about climate change they teach about it in elementary school. They would have learned nothing new about climate change, nothing.

