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UNITED NATIONS — World leader after world leader told the United Nations on Monday that they will do more to prevent a warming world from reaching even more dangerous levels, but as they made their pledges, they conceded it was not enough.

Sixty-six countries have promised to have more ambitious climate goals and 30 swore to be carbon neutral by midcentury, said Chilean President Sebastian Pinera Echenique, who is hosting the next climate negotiations later this year.

Heads of nations such as Finland and Germany promised to ban coal within a decade.

US President Donald Trump dropped by, listened to German Chancellor Angela Merkel’s detailed pledges, including going coal-free, and then left without saying anything.

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And even before world leaders made their promises in three-minute speeches, 16-year-old climate activist Greta Thunberg in an emotional speech chided the leaders with the repeated phrase, ‘‘How dare you.’’

‘‘This is all wrong. I shouldn’t be up here,’’ Thunberg said. ‘‘I should be back in school on the other side of the ocean. Yet you have come to us young people for hope. How dare you. You have stolen my dreams and my childhood with your empty words.

“Yet, I am one of the lucky ones. People are suffering. People are dying. Entire ecosystems are collapsing. We are at the beginning of a mass extinction, and all you can talk about is money and fairy tales of eternal economic growth. How dare you.

“For more than 30 years, the science has been crystal clear. How dare you continue to look away, and come here and say you’re doing enough when the politics and solutions needed are still nowhere in sight,” she said.

She told the UN that even the strictest emission cuts being talked about only gives the world a 50 percent chance of limiting future warming to another 0.4 degrees Celsius (0.72 degrees Fahrenheit) from now, which is a global goal.

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‘‘We will not let you get away with this,’’ Thunberg said. ‘‘Right now is where we draw the line.

“You are failing us,” she said. “Young people are starting to understand your betrayal. The eyes of all future generations are upon you. And if you choose to fail us, I say, we will never forgive you.”

UN Secretary-General Antonio Guterres opened the Climate Action Summit by saying: ‘‘Earth is issuing a chilling cry: Stop.’’

Guterres told world leaders that it’s not a time to negotiate but to act to make the world carbon neutral by 2050. He said the world can hit its strictest temperature goal that Thunberg alluded to.

More than 60 world leaders are set to speak.


Jaclyn Reiss of the Globe staff contributed to this report.