The voices of climate strikers are being heard, but politicians are still not taking action, Swedish climate activist Greta Thunberg said Friday at a summit in Madrid.

“We are getting bigger and bigger, and our voices are being heard more and more, but of course that does not translate into political action,” Thunberg told a news conference during the United Nations-sponsored COP25 climate gathering.

Thunberg, who has sparked a global youth-led protest movement, said asking children to skip school to protest inaction by governments on climate change was “not a sustainable solution.”

“We don’t want to continue. We would love some action from people in power,” she said. “People are suffering and dying from the climate and ecological emergency today and we cannot wait any longer.”