US Secretary of State John Kerry has arrived in Indonesia on a visit to highlight concerns over climate change, after agreeing with China to boost joint efforts to fight global warming.
"In order to meet the global and the economic challenge of climate change, undeniably all of us are going to have to do more," Kerry said as he toured a factory on the edge of Beijing before flying to Jakarta on Saturday.
China and the United States are the world's two largest emitters of greenhouse gases blamed for global warming, accounting for some 40 per cent of total planetary emissions.
Kerry's comments during a 24-hour visit to Beijing came as a thick grey smog shrouded the Chinese capital, with pollution reaching "hazardous" levels on unofficial air quality indexes late on Friday.
"We both have a special role to play in reducing those emissions," Kerry told workers at the Cummins-Foton joint venture producing clean diesel engines.
In Jakarta, Kerry will hold talks with senior Indonesian leaders including President Susilo Bambang Yudhoyono during his two-day visit to the country.
His visit came as Indonesia began to reopen airports following a volcanic eruption on the main island of Java that killed four people and forced mass evacuations.
The US Secretary of State is set to give a major speech on climate change on Sunday.
Indonesia is one of the world's biggest carbon emitters because of rampant deforestation, and many of the archipelago's 17,000 islands could be threatened by rises in sea levels.
Kerry announced on Saturday he'd agreed China and the US would join forces to share information on efforts to combat climate change ahead of UN-led efforts to set emission reduction goals for 2020.
"China and the United States will put an extra effort into exchanging information and discussing policies ... to develop and lead on the standards" to be announced next year, Kerry said.
