China ratifies Paris climate deal ahead of G-20 summit

U.S. President Barack Obama, second from right, waves as he arrives at the Hangzhou Xiaoshan International Airport, Saturday, Sept. 3, 2016, in Hangzhou, China, to attend the G-20 summit. Obama is expected to meet with China's President Xi Jinping Saturday afternoon. (AP Photo/Mark Schiefelbein)
A Chinese volunteer poses for a photo in front of Air Force One after U.S. President Barack Obama arrived at the Hangzhou Xiaoshan International Airport, Saturday, Sept. 3, 2016, in Hangzhou, China, to attend the G-20 summit. Obama is expected to meet with China's President Xi Jinping Saturday afternoon. (AP Photo/Mark Schiefelbein)
U.S. President Barack Obama arrives on Air Force One at the Hangzhou Xiaoshan International Airport, Saturday, Sept. 3, 2016, in Hangzhou, China, to attend the G-20 summit. Obama is expected to meet with China's President Xi Jinping Saturday afternoon. (AP Photo/Mark Shiefelbein)
Chinese President Xi Jinping, right, and Argentina's President Mauricio Macri, second left, during their meeting at the West Lake State Guest House in Hangzhou, China Saturday, Sept. 3, 2016. (Lintao Zhang/Pool Photo via AP)
White smoke billows from a coal-fired power plant near the residential buildings in Beijing, Saturday, Sept. 3, 2016. China announced on Saturday that it has ratified the emissions-cutting agreement reached last year in Paris, giving a big boost to efforts to bring the accord into effect by the end of this year. (AP Photo/Andy Wong)
A woman carrying an umbrella to protect from the sun as she walks past a billboard promoting environment protection on display near a construction site at the Central Business District of Beijing, Saturday, Sept. 3, 2016. China announced on Saturday that it has ratified the emissions-cutting agreement reached last year in Paris, giving a big boost to efforts to bring the accord into effect by the end of this year. The words on the billboard read "Protect environment, start from you and me." (AP Photo/Andy Wong)

HANGZHOU, China — China announced on Saturday that it has ratified the emissions-cutting agreement reached last year in Paris, giving a big boost to efforts to bring the accord into effect by the end of this year.

The United States was also expected to announce that it was formally joining the Paris Agreement in advance of the Group of 20 summit that starts Sunday in the eastern Chinese city of Hangzhou. Obama landed in Hangzhou Saturday and was scheduled to speak about climate change shortly afterward.

While tensions have risen between Beijing and Washington during Obama's term over issues including cyber hacking, the South China Sea and the planned deployment of a U.S. anti-missile system in China's neighbor South Korea, combating climate change is one area where both countries have stressed they can work together.

China is the top emitter of man-made carbon dioxide emissions, and the United States is second. Together, they produce 38 percent of the world's man-made carbon dioxide emissions.

Both were key to getting an agreement in Paris last year. To build momentum for a deal, they set a 2030 deadline for emissions to stop rising and announced their "shared conviction that climate change is one of the greatest threats facing humanity."

China had said in April that it would ratify the Paris Agreement, negotiated by representatives of 195 nations in Paris last year, before its hosting of the G-20 summit. The agreement goes into force when joined by at least 55 nations that produce a total of 55 percent of global emissions.

Before China's announcement, 23 countries had ratified or otherwise joined the agreement, representing just 1 percent of global emissions, according to the World Resources Institute.

The proposal adopted by China's National People's Congress Standing Committee says the agreement will help China "play a bigger role in global climate governance," state-run Xinhua News Agency reported Saturday.

Li Shuo, senior climate policy adviser for the environmental group Greenpeace, said Saturday that the two countries acting on the agreement was "a very important next step."

If the agreement is eventually adopted, he said, "we'll have a truly global climate agreement that will bind the two biggest emitters in the world."

The agreement's long-term goal is to keep global warming below 2 degrees Celsius (3.6 degrees Fahrenheit), compared with pre-industrial times. It has an aspirational goal of limiting the temperature rise to 1.5 degrees C (2.7 degrees F). Temperatures have already risen by almost 1 degree C (1.8 degrees F) since the industrial revolution.

Under the Paris Agreement, countries are required to set national targets for reducing or reining in their greenhouse gas emissions. Those targets aren't legally binding, but countries must report on their progress and update their targets every five years. The first cycle begins in 2020. Only developed countries are expected to slash their emissions in absolute terms. Developing nations are "encouraged" to do so as their capabilities evolve over time.

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