China’s President Xi Jinping has urged leaders of the world’s 20 largest economies to avoid “empty talk” as they look to quicken economic growth.
World leaders are at the annual economic summit, which is being hosted in China for the first time.
President Xi said the global economy was recovering but faced multiple challenges in finance and trade.
Also up for discussion are the global steel crisis, the UK’s Brexit talks and tax of multinationals like Apple.
President Xi said: “Against risks and challenges facing the world economy, the international community has high expectations of the G20 in the Hangzhou summit.”
Ahead of the meeting, the International Monetary Fund (IMF) warned it was likely to downgrade its forecast for global economic growth again this year.
The IMF has already reduced its global outlook after the Brexit vote, cutting forecasts for world GDP growth to 3.1 per cent for 2016 and 3.4 per cent for 2017.
It is the final G20 summit for US President Barack Obama and the first for British Prime Minister Theresa May.
At a joint press conference, President Obama said the first task for Britain following the EU referendum was to “figure out what Brexit means with respect to Europe”.
He added that the US would prioritise its trade talks with the EU – known as the Transatlantic Trade and Investment Partnership (TTIP) – ahead of talks with the UK.
Mrs. May will be explaining at the summit what the British decision to leave the EU might entail.
Japan’s government has issued a stark warning at the summit about the possible impact of Brexit on the country’s firms operating in the UK.
Mrs. May has also defended her surprise delay in making a decision on the £18bn Hinkley Point nuclear power project, saying she would “look at the evidence and consider it properly”.
“I’ve been very clear that I will be doing that and will be taking a decision sometime this month,” she added.