Porrill spoke at the megaphone about her first time scuba diving, and the majesty of the coral reefs, which are being threatened by a changing climate and ocean acidification.
Schoolchildren in Cambridge have set up an eco-council to work together to learn about, and find solutions to, the climate and ecological crisis. Almost 100 schools are expected to participate, Thunberg said on Twitter.
While the school discusses climate change in classes a lot, the students were keen to take part in some direct action - though they were concerned about the impact missing lessons would have on their school record, he said.
- Protests in Madrid and more than 50 other Spanish cities drew thousands.
Regina students gathered to make protest signs in advance of Friday's Strike 4 Climate.
Some politicians have criticized the students, suggesting they should be spending their time in school, not on the streets. The 16-year-old climate activist has been playing hooky every Friday since last August to protest outside Sweden's parliament building.
Students hold up placards and shout slogans as they march during the "Fridays for Future" movement on a global day of student protests aimed at sparking world leaders into action on climate change, in Madrid on March 15.
Would you like to see a march of parents and grandparents to demand more action on climate change?
About 17 people were arrested by the New York Police Department for disorderly conduct and blocking traffic
"We want our government to understand that there is no planet B", says Rand Abounahia, another one of the strike organizers.
Wellington university student Josie Mason, 20, said she was "excited by the fact that youth are being heard and are making a stand right now".
"People always tell us that they are so hopeful, they are hopeful that the young people are going to save the world". But then the U.N.'s IPCC report came out previous year [and] it pushed me even further to take action.
A new report from worldwide experts is ringing the alarms of climate change.
"It's vital now that politicians don't just listen - we need decisive action to stop climate breakdown". "Why should we go and study for a future that may not exist anymore?"
"I have genuine fear that my future will not be what it should be".
Supporting the kids: The 62-year-old wrote on Instagram: "You know the world has changed coz (sic) we caught a train to join #ClimateStrike with the school kids, they were amazing".
In Stockholm, Thunberg predicted that students won't let up their climate protests.
"The people in office now are not going to be here for the true effects of climate change", said Olivia Porrill, of Gardendale, who is a senior at the Alabama School of Fine Arts.