Agence France-Presse: British Prime Minister Gordon Brown’s visit to China switched to environmental issues yesterday, as he sought to boost cooperation between the two nations on tackling climate change, senior Downing Street officials said. Brown, whose focus on Friday was on furthering business links with the world’s fastest-growing economy, was looking to secure backing for a new global deal on fighting greenhouse gas emissions for when the Kyoto Protocol expires in 2012. How Britain can help …