"Together, China and the United States, the world's two largest greenhouse gas emitters, represent nearly 38 per cent of global emissions. Now, by formally joining the Paris Agreement, you have added powerful momentum to the drive for the Agreement to enter into force this year," the UN chief said at a ceremony here.
Ban congratulated Chinese President Xi Jinping and US President Barack Obama as he received the legal instruments for joining the Paris Agreement from the world's two largest greenhouse gas emitters.
In the ceremony, Ban noted that another 29 countries representing 16 per cent of global emissions are required to bring the Paris Agreement into force.
"I am hopeful and optimistic that we can do it before the end of this year and before my term as Secretary-General of the United Nations ends," Ban said.
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So far, a total of 26 countries, accounting for 39 per cent per cent of global emissions have now officially joined the Paris Agreement, which will enter into force 30 days after at least 55 countries, accounting for 55 per cent of global greenhouse gas emissions, deposit their instruments of ratification or acceptance with the Secretary-General.
"While we were waiting, he asked me what I want to do after retirement. Well, Mr President, I am going to write some memoir: one of the many important, inspiring thing will be my inspiring moment of President Obama's leadership (in Copenhagen)," Ban said.
"Have you ever imagined the President of the United States, holding his own laptop, going around the Heads of State sitting in a small chair, proposing a draft and changing it on the spot? I would have never expected that the US President would do that and I was so much inspired. He inspired everybody," he said.
The event will build on the "strong political momentum" from Paris for urgent global action on climate change by all countries, which is essential for achieving the Sustainable Development Goals and creating a more prosperous, equitable and liveable future for all people, he said.
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Ban is scheduled to attend the G20 summit in China tomorrow.
With the Paris Agreement, the world has an equitable, durable yet flexible global framework for reducing emissions, strengthening climate resilience and providing support to developing countries to build low-carbon economies and adapt to inevitable climate impacts, the Secretary-General said.
"And now, with these two big countries joining the Paris Agreement, I am sure that we can really set a very ambitious dynamic step forward," he added.