Hundreds of school students, parents and supporters gathered in Prince's Square in Launceston on Friday during the worldwide school strike for action on climate change.
Students from Launceston College, Launceston Church Grammar, Scotch and St Patrick's colleges gave speeches calling for the government to stop Adani, end the use of fossil fuels and transition to 100 per cent renewable energy by 2030.
Watch some of the speeches below:
Launceston College Year 12 student Anna Roberts said the need to act was urgent.
"Already, our planet's average surface temperature has risen 0.9 degrees Celsius since the late 19th century," she told the crowd.
"Already, Greenland has lost 286 billion tonnes of ice between 1993, and 2016, per year.
"Already, our sea levels have risen 20-centimetres in the last century.
"Already, the amount of carbon dioxide being absorbed by the upper layers of our ocean is increasing by two million tonnes per year.
"Already, since 1955, 90 per cent of the excess heat trapped in our atmosphere by greenhouse gases has been stored in our oceans."