The United States and China, the world’s two largest emitters of carbon dioxide, unveiled a deal to ramp up cooperation tackling the climate crisis. US climate envoy John Kerry and his Chinese counterpart Xie Zhenhua announced the framework agreement at the UN climate conference in Scotland. Both billed it as way to tip the summit toward success. ‘In the area of climate change’, Xie Zhenhua said. ‘There is more agreement between China and the US than divergence, making it an area with huge potential for cooperation’.