US Secretary of State John Kerry has been in Indonesia talking about climate change.<br /><br />He spoke to students at the American Cultural Centre in Jakarta, telling them:<br /><br />“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.” <br /><br />On Friday, Kerry came to an agreement with China for the two countries to cooperate more closely on fighting climate change. <br /><br />China and the United States are the biggest emitters of carbon dioxide and other gases that alter the climate. <br /><br />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.