The Japanese and Canadian prime ministers also used the summit to commit to a new 2030 target, while Brazil pledged to achieve emissions neutrality by 2050.
Chinese President Xi Jinping reiterated his country's commitment to carbon neutrality by 2060 and reducing emissions from 2030. He also announced plans to limit the increase in coal consumption.
President Xi also wants more developed countries to make concrete efforts to help developing countries accelerate their transition to green and low-carbon development.
A senior official in the Biden administration warned before the summit that there must be a change in Australia's climate change policy, but Prime Minister Scott Morrison has resisted the pressure.
Australia aims to reduce carbon emissions by only between 26 and 28 percent by 2005 levels by 2030 - about half the size of the U-S revised goal.
Mr Morrison said Australia was focused on "how" to reduce emissions, rather than setting new targets.
