Both nations' targets are relative to 2005 emissions levels.
The Xinhua account quotes Qi Jianguo, a researcher at the Chinese Academy of Social Sciences, stating that China's intensity target means that its emissions in 2020 would be roughly the same as they are today.
Also today, the Chinese government announced that Premier Wen Jiabao will attend the Copenhagen summit. The White House said yesterday that President Obama would attend Dec. 9. The summit runs from Dec. 7-18.