Reuters: China said rich nations must vow greater cuts in greenhouse gas emissions and warned of lost trust in talks over a climate change deal, while rich countries accused Beijing of under cutting progress. Feuding on Friday over the future of a key U.N. treaty on fighting climate change, the Kyoto Protocol, has diluted hopes that negotiations in the Chinese city of Tianjin can lay a firm base for agreeing on a new, binding climate deal next year. The week-long talks end on Saturday …