US Secretary of State John Kerry has been in Indonesia talking about climate change.

He spoke to students at the American Cultural Centre in Jakarta, telling them:

“When I think about the array of global climate, of the global threats; think about this: terrorism, epidemics, poverty, the proliferation of weapons of mass destruction. All challenges that know no borders. The reality is that climate change ranks right up there with every single one of them.”

On Friday, Kerry came to an agreement with China for the two countries to cooperate more closely on fighting climate change.

China and the United States are the biggest emitters of carbon dioxide and other gases that alter the climate.

The United States is also the only major industrialised nation to not have ratified the Kyoto protocol which commits developed countries to reducing their greenhouse gas emissions.