Osaka, June 27 -- Trade and geopolitical tensions, and the looming threat of climate change, are on the agenda as Chinese President Xi Jinping and other world leaders gather in Osaka, Japan, for a summit of the Group of 20 major economies.

While prospects for detente in the trade war between the United States and China are in the spotlight, many participating are calling for a broader perspective in tackling global crises.

"This will be a difficult G-20, there are global challenges to be met, we need to step up to avoid the climate threats, ... reform the World Trade Organization and prepare for the digital revolution," Donald Tusk, president of the European Union Council, said at a meeting with Japanese Prime Minister Shinzo Abe.

The ...