The CEO of SpaceX, Musk has said further delay in adopting policies to mitigate climate change would cause more "destruction than all the wars in history combined".
"I will be announcing my decision on Paris Accord, Thursday at 3:00 pm".
"We will continue to lobby the Americans and the White House to show the leadership they have shown in the past on reducing CO2", he said.
"China and the European Union. will implement the agreement", a senior European Union official told reporters on Wednesday, speaking on condition of anonymity.
The protest, organised by 350 DC group, was announced on Wednesday night and is set to follow Trump's announcement on Thursday of whether the USA will remain a party to the 196-nation agreement aimed at curbing the effects of climate change, The Hill magazine reported.
President Donald Trump is expected to announce his decision on whether to abandon the Paris climate accord Thursday.
Merkel said she was pleased China was sticking to the Paris climate accord, adding that "the cooperation of the European Union with China in this area will play a crucial role especially in regards to new technologies".
The EU official involved in organizing the EU-China meeting said it would will "send important signals for the multinational system", as Trump moves to unpick some of the global trade agreements the USA has signed up to.
The ad said that climate change is both a "business risk" and a "business opportunity", and said continued participation in Paris will actually benefit the US economy and job growth.More news: Donald Trump lashes out at Germany over trade, North Atlantic Treaty Organisation ; promises change
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Under the Paris accord, the U.S. promised to cut its greenhouse gas emissions 26% to 28% below the levels in 2005 by 2025.
The head of the Environmental Protection Agency, Scott Pruitt, who met with Trump on Tuesday, wants Washington to quit the Paris deal, which he believes is "bad" for the country. Not everything that is law or that is written in global treaties is fake news.
And the corporate world has mostly come out in favor of the United States keeping its seat at the table.
German Chancellor Angela Merkel dubbed the summit "dissatisfying".
She described the discussion as "very hard, not to say very unsatisfactory".
China asked that the annual the summit, normally held in mid-July, be brought forward to press home President Xi Jinping's defence of open trade at the World Economic Forum in Davos in January, in response to Trump's protectionist stance.
UN Secretary General Antonio Guterres has weighed in, arguing on Tuesday that the United States should not leave the Paris Agreement.
Without mentioning the USA specifically, he said China has been "actively promoting the Paris agreement and we were one of the first countries to ratify the Paris agreement".