SEOUL, South Korea (AP) — The United States and China, the world’s two biggest carbon polluters, have agreed to cooperate with other countries to curb climate change, just days before President Joe Biden hosts a virtual summit of world leaders to discuss the issue.

The agreement was reached by U.S. special envoy for climate John Kerry and his Chinese counterpart Xie Zhenhua during two days of talks in Shanghai last week, the State Department said in a statement Saturday.

“The United States and China are committed to cooperating with each other and with other countries to tackle the climate crisis, which must be addressed with the seriousness and urgency that it demands,” the joint statement said.

China and the United States are the world’s top carbon polluters, pumping out nearly half of the fossil fuel fumes that are warming the planet’s atmosphere. Their cooperation is key to the success of global efforts to curb climate change, but frayed ties over human rights, trade and China’s territorial claims to Taiwan and the South China Sea have been threatening to undermine such efforts.

Kerry’s Shanghai trip marked the highest-level travel to China by a U.S. official since Biden took office in January. From Shaghai, the former secretary of state flew to South Korea for talks.

Biden has invited 40 world leaders, including Chinese President Xi Jinping, to the April 22-23 summit. The U.S. and other countries are expected to announce more ambitious national targets for cutting carbon emissions ahead of or at the meeting, along with pledging financial help for climate efforts by less wealthy nations.

It’s unclear how much Kerry’s China visit would promote U.S.-China cooperation on climate issues.

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When Kerry was still in Shanghai, Chinese Vice Foreign Minister Le Yucheng signaled Friday that China is unlikely to make any new pledges at next week’s summit.

“For a big country with 1.4 billion people, these goals are not easily delivered,” Le said during an interview with The Associated Press in Beijing. “Some countries are asking China to achieve the goals earlier. I am afraid this is not very realistic.”

On whether Xi would join the summit, Le said “the Chinese side is actively studying the matter.”

During a video meeting with German and French leaders Friday, Xi also said that climate change “should not become a geopolitical chip, a target for attacking other countries or an excuse for trade barriers,” though he called for closer cooperation on the issue, according to the official Xinhua News Agency.

Biden, who has said that fighting global warming is among his highest priorities, had the United States rejoin the Paris climate accord in the first hours of his presidency, undoing the U.S. withdrawal ordered by predecessor Donald Trump.

Major emitters of greenhouse gases are preparing for the next U.N. climate summit taking place in Glasgow, U.K., in November. The summit aims to relaunch global efforts to keep rising global temperatures to below 2.7 degrees Fahrenheit as agreed in the Paris accord.

According to the U.S.-China statement, the two countries would enhance “their respective actions and cooperating in multilateral processes, including the United Nations Framework Convention on Climate Change and the Paris Agreement.”

It said both countries “are firmly committed to working together and with other Parties to strengthen implementation of the Paris Agreement.”

Associated Press writer Ken Moritsugu in Beijing contributed to this report.