Agence France-Presse: China is ready to strengthen its cooperation with the United States to combat climate change, Premier Wen Jiabao told US House Speaker Nancy Pelosi on Wednesday, state media reported. "China will cement policy dialogue with the United States, take the joint tackling of climate change as an important aspect of cooperation and push for positive results in the Copenhagen Climate Change Conference," Xinhua news agency quoted Wen as saying. China, the third-largest economy in the …