Fresh pledges by governments to cut emissions are raising hopes but aren’t strict enough to keep global warming from exceeding 1.5 degrees Celsius (2.7 degrees Fahrenheit) by the end of the century.

The head of the United Nations says a “leadership gap” is undermining the world’s efforts to curb global warming, days before presidents and prime ministers from around the globe gather for a climate summit in Glasgow, Scotland, AP reports.

U.N. Secretary-General Antonio Guterres told reporters Tuesday that time is running out to cut greenhouse gas emissions and meet the goals of the 2015 Paris accord to avert global warming that he said could become “an existential threat to humanity.”

“The clock is ticking,” he said in New York at the presentation of a U.N. report highlighting the difference between what scientists say is needed and what countries are doing to reduce the amount of greenhouse gas being pumped into the atmosphere. “This is a moment of truth.”

“The emissions gap is the result of a leadership gap,” Guterres said. “But leaders can still make this a turning point to a greener future instead of a tipping point to climate catastrophe. ”

The new report by the U.N. Environment Programme found fresh pledges by governments to cut emissions are raising hopes but aren’t strict enough to keep global warming from exceeding 1.5 degrees Celsius (2.7 degrees Fahrenheit) by the end of the century.

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