AP: China’s leaders are promising to narrow its huge trade surplus and curb surging emissions of climate-changing greenhouse gases in an ambitious five-year plan to make its economy cleaner and more high-tech. The Communist Party plan also promises to encourage consumer spending to reduce reliance on exports to power growth. The plan was approved last week by party leaders and reported Thursday by state media. Such five-year plans are a holdover from China’s era of central planning but the ruling…