China’s top climate change official rejected a US suggestion to impose tariffs on some imports from countries that do not place a price on carbon, saying the United States should do more to cut its own greenhouse gas emissions instead, Reuters reported. US Energy Secretary Steven Chu on Tuesday told a congressional panel that once Washington develops a system limiting carbon emissions, the United States will be at a disadvantage if other countries do not impose a cost on carbon emissions. But Xie Zhenhua, head of China’s Climate Change and Coordinating Committee objected. "Climate change and charging carbon taxes in imports … are two issues in two areas," he said, and should be negotiated separately. Earlier this week, Gao Li, director of China’s Department of Climate Change, said countries that buy Chinese goods should be held responsible for the carbon dioxide emitted by the factories that make them.