Young people from across Tayside and Fife took part in the climate change protest.
St Andrews University students marched through the town from St Salvator’s Quad in support of the day.
Second year student and passionate eco-activist Lea Weimann said: “St Andrews might just be a small town and we might not be able to gather a crowd as big as a city, but we still want to demonstrate how much we care.
“Climate change is not just an environmental issue, but a social and economic one as well.
“It touches on every aspect of our lives and changes our future on Earth forever.
“We are at the beginning of a new era – a world requiring major change, a world requiring collective action, a rise-up of citizens from around the world, a call for action.”
She added: “As the youth, we are told to work and study hard for our future but with climate change progressing the question arises, what future? How does that future look?
“The fossil fuel industry still dominates our lives. Animal agriculture is still left largely undebated. Plastic pollution is choking our planet.
“Our linear economy is producing and throwing away more items every minute. It is time to wake up. It is time to arise to the biggest collective challenge of our century –climate change.
“The signs are clear – everywhere extreme weather events are becoming the norm and record temperatures are being hit. We, as the youth, demand climate action.
“We deserve a future on a habitable planet. There is no Planet B.”
George Habeshaw, 9, and sister Flora, 7, were among Fife children who took part in the protest at the Scottish Parliament.
The Falkland Primary School pupils and mother Andrea travelled with a number of other families, by train, to Holyrood.
They were inspired by the speech of young Swedish environmental activist Greta Thunberg and worried by the warning that there were only 12 years to prevent catastrophic climate change.
Andrea said her children were very angry about the way climate change was not being taken seriously enough.
She said: “If I didn’t give them the opportunity to do something now in 12 years’ time are they going to me say to me ‘are we among the people who did nothing or did we do something’?”