The United States would cut their 2005 carbon emissions by 26 % to 28 % by 2025 .
China would peak their carbon emissions by 2030 and strive to achieve 20 % of United States ' energy from sources that do not produce carbon emissions .
The United States would cut their 2005 carbon emissions by 26 % to 28 % by 2025 , while China would peak their carbon emissions by 2030 and strive to achieve 20 % of its energy from sources that do not produce carbon emissions .