Teen climate activist Greta Thunberg and fellow youth campaigners struck a skeptical tone for this week's climate talks in Italy on Tuesday, saying much has been promised but little done to tackle global warming in almost three decades since the landmark Earth Summit.

Fears that climate change is worsening grew after a United Nations report in August warned the situation was dangerously close to spiraling out of control, with the world certain to face further disruptions for generations to come.

"Thirty years of blah, blah, blah," Thunberg told the opening session of a Youth4Climate event.

Thousands of young activists have converged on Milan this week with some 400, from about 190 countries, due to engage with policymakers to hammer out proposals for possible solutions.

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