Launceston's School Strike 4 Climate follows a national round in November which included about 1000 students leaving classrooms to rally on the lawns outside Hobart's Parliament House.

The movement originated in Sweden with a 15-year-old student named Greta Thunberg. Over 550 people have registered their interest on the Facebook event for the Princes Park strike.

"And the reason there are so many students doing this strike is because we're not old enough to vote, and by the time we are … it's going to be too late to do something about the climate," said Anna Roberts, a year 12 student who is part of the cross-school organising group.

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Parents, grandparents, community groups and teachers are also expected to make up the crowd on the day. The event will start at noon. 

"Part of the event is showing solidarity between young people and other people [on climate change]," said Joseph Savva another member of the group.

In Australia, the movement is calling for no new coal mines to be built, including one proposed by Adani in North Queensland, and a transition to 100 per cent renewable energy by 2030.

Tasmanian Greens Senator Peter Whish-Wilson said there had never been a "more important time" for politicians to listen with young Australians "now taking to the streets to protest a lack of political action on climate change."

A Tasmanian government spokesperson said they understood students would want to attend the event, but given it was a school day the advice for schools is that students are expected to attend classes.

They added that if students intended to attend the rallies, parents and carers needed to advise their schools to enable principals to exercise their duty of care.

“The Hodgman Liberal Government has an ambitious target to become fully self-sufficient in renewable energy by 2022, and to achieve the lowest regulated power prices in the same timeframe,” the spokesperson said.

[RELATED: On climate and politics, young Tasmanians look for answers]

Labor environment spokesperson Alison Standen said civic engagement among students should be encouraged.

"Younger people have the most at stake for their future when it comes to climate change," Ms Standen said.

In an opinion piece for Australian Community Media, parenting author Steve Biddulph argued it was not only acceptable "but essential for the mental health of young people" that they were able to act on their "greatest fears".

"If you are a grandparent or caring adult, be there in the back, making sure they are safe, letting them know you are going to do more and more until all coal stays in the ground, all power is renewable, and the emissions start to go down."

"Don’t let the kids face this on their own."

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