John Kerry, the US representative for climate change, will travel to China on Sunday to meet with Xie Zhenhua and resume stalled negotiations between the two largest producers of greenhouse gases in the world.

The third trip Kerry has made to China as President Joe Biden’s climate diplomat comes after weeks of summer heat records, which scientists warn are being exacerbated by climate change.

Last year, bilateral climate negotiations came to a halt after Nancy Pelosi, the US House of Representatives’ speaker at the time, visited Taiwan, which is self-governing, angering Beijing, which regards the island as part of its territory.