, which he said is as great a threat as terrorism or the proliferation of weapons of mass destruction: 'When I think about the array of global climate – of 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"> , which he said is as great a threat as terrorism or the proliferation of weapons of mass destruction: 'When I think about the array of global climate – of 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">