WASHINGTON — The world moved closer to curbing the worst of global warming after this week’s climate summit. But there’s still a long way to go, and the road to a safer future gets even rockier from here.

With the world trying to prevent more than another half-degree of warming or so to achieve the most stringent of goals set by the 2015 Paris climate accord, scientists and politicians alike say this decade is crucial for any chance of getting that done. And that means 2021 is a “make-or-break year for people and the planet,” U.N. Secretary-General Antonio Guterres said.

Everything culminates in November with heavyweight climate negotiations in Glasgow, Scotland. While these climate meetings happen annually, every five or so years there is a weightier session of the type that in the past has led to major deals or disappointments. It’s that time again.

By November, the U.N. climate negotiating process calls for 200 nations to ratchet up commitments to cut emissions of greenhouse gases by 2030. The rich countries need to come up with more money to help the poor countries develop greener power and adapt to climate change’s harsh realities. And nations need to agree on a price on carbon pollution after several years of gridlock.

“Glasgow is the world’s last best hope,” said U.S. special climate envoy John Kerry.

There will be important stops in Germany in May for a minister’s level meeting, in a British seaside town in June for a meeting of leaders of big economies and a final push at U.N. headquarters in September, but everything is about what President Joe Biden called “a road that will take us to Glasgow.”

Biden’s summit, organized in less than 100 days, was designed to send the world off on a fast start toward Glasgow, and experts said it did so. They figure it pushed the globe anywhere from one-eighth to more than halfway along the journey, with mixed opinions on whether the United States did enough.

“If it were 100 miles to Glasgow, we have just done the first 12 miles on the lowlands, and we have a 88 hard miles to go, with a lot of difficult terrain to cross before we get there,” said Bill Hare, director of the German think tank Climate Analytics. Hare said while countries showed a significant increase in ambition to fight climate change, he was “hoping for slightly more.”

With the new targets from the United States, the United Kingdom, European Union, Japan and Canada, the new emissions gap is 22 billion to 26 billion tons of carbon pollution. Hare chastised Australia’s efforts as “really disgraceful” and said Brazil made a weaker pledge than in 2015, while Russia didn’t offer anything substantive.

“The Earth Day summit substantially improved the odds of a successful global climate summit in November,” said Nigel Purvis, a climate negotiator in the Clinton and George W. Bush administrations. “With new action by rich nations and new assistance for poor nations, the world should be able to make additional progress in 2021.”

Poorer nations that haven’t made big pollution cut promises yet, especially India, are waiting to see if promises about financial help become more concrete before they commit to pollution cuts, Hare said. But there’s hope because of Biden’s promise to double public climate finance available to developing countries by 2024 and Germany’s announcing

4 billion euros a year extra, Hare said.

Also important was South Korea’s promise to stop financing coal power plants in other countries, Hare said. Activists hope China and Japan will follow suit, but they haven’t yet.

Alice Hill, a senior fellow for energy and environment at the Council on Foreign Relations, said this week’s summit “did not alone lead to the kind of enormous leap toward that what we need in fighting climate change.”

While the U.N.’s Guterres noted strengthened commitments, he said, “There is still a long way to go.”

Former New York Mayor Mike Bloomberg, Guterres’ special envoy for climate ambitions and solutions, told the Associated Press that “There’s no question we moved forward. ... But now comes the hard work — actually delivering results.”

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