China ratifies climate change agreement ahead of G20

China ratifies climate change agreement ahead of G20

China 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 which starts on Sunday in in the eastern Chinese city of Hangzhou.

The White House announced President Barack Obama would speak about climate change shortly after landing on Saturday.

Tensions have risen between Beijing and Washington during Mr Obama's term over issues including cyber hacking, the South China Sea and the planned deployment of a US anti-missile system in China's neighbour South Korea.

But 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 US is second. Together, they produce 38% 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% of global emissions.

Before China's announcement on Saturday, 23 countries had ratified or otherwise joined the agreement, representing just 1% 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.

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

He said if the agreement is eventually adopted "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 2C, compared with pre-industrial times. It has an aspirational goal of limiting the temperature rise to 1.5C. Temperatures have already risen by almost 1C 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 are not 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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