BBC: US Secretary of State John Kerry has urged the global community to act against climate change in a keynote speech during a visit to Indonesia.
He said that there was scientific proof of climate change threatening not only the environment, but also the world economy.
He said "the window of time is still open" to prevent the worst consequences, but that it was closing.
The US, along with China, is the biggest emitter of greenhouse gases.
On Saturday, both nations issued a joint statement...