Business Green: The standoff at the centre of the UN’s long-running climate change negotiations reared its head again at the latest round of talks in Tianjin today, when one of China’s top negotiators reiterated his call for industrialised nations to adopt more ambitious emission reduction targets. Officials had hoped that the latest week-long round of talks in the northern Chinese port city would focus on those areas where agreement is likely to be achieved at the upcoming Cancun summit, such as …