The leaders' news conference was delayed for three hours as they sought to find agreement.
The name of the rally was a nod to Trump's line during Thursday's announcement that he would withdraw the United States from the accord on climate change, saying: 'I was elected to represent the citizens of Pittsburgh, not Paris'.
While Putin's government signed the 2015 Paris accord, he has delayed formally ratifying the agreement for at least two more years.
An MIT scientist has accused US President Donald Trump of manipulation and misuse of an MIT study he co-authored to justify the decision of pulling the US out of the Paris Climate Agreement, the first global climate pact with worldwide representation under the United Nations Framework Convention on Climate Change (UNFCCC). "We deem the momentum generated in Paris in December 2015 irreversible, and we firmly believe that the Paris agreement can not be renegotiated since it is a vital instrument for our planet, societies and economies", French President Emmanuel Macron, German Chancellor Angela Merkel and Italian Prime Minister Paolo Gentiloni said in a joint statement.
There is great danger, however, in leaving the responsibility for minimizing climate change-causing emissions, much of which come from the burning of oil and gas, to corporations, because they are focused on maximizing profits.More news: NY Times: Trump Not Planning to Invoke Executive Privilege for Comey Testimony
In the wake of the Trump administration's sudden withdrawal from the global stage, local leaders - especially, though not limited to, those in progressive areas of the country - are recommitting to their work on climate policy.
The study makes worst-case assumptions that may inflate the cost of meeting US targets under the Paris accord while largely ignoring the economic benefits to USA businesses from building and operating renewable energy projects. "The Paris agreement is here to stay and the 29 articles of the Paris agreement are not to be renegotiated", he said after meeting his Chinese counterpart.
The Paris agreement commits the USA and 187 other countries to keeping temperatures below 2C (3.6F) above pre-industrial times and "endeavour to limit" them even more, to 1.5C.
Under the pact, the United States - the world's second biggest carbon emitter behind China - had committed to reduce its emissions by 26 percent to 28 percent from 2005 levels by 2025.
Trump said the agreement was bad for the USA economy. Even among those who voted for Trump, far more believe the US should participate in the Paris agreement than oppose it. "What was said was said and so you have to think what to do next.Bad summer weather in Russian Federation is due to American imperialism", he said.More news: No sign of the ultimate deal as Donald Trump leaves Israel
The EU's commissioner for climate action and energy, Miguel Arias Cañete, said the climate accord would continue and that it would be global leaders who would fill the void left by the U.S. departure from the deal.
Trump claimed the U.S.
"Today, we reaffirm, more than ever, our commitment to collective action for our climate and sustainable development, in particular for the most vulnerable".
"As some of the largest companies based or operating in the United States, we strongly urge you to keep the United States in the Paris Agreement on climate change", they wrote.
Now the world is reacting badly, and protests across the western world against Trump are nearly bound to be held at this point.More news: World leaders vow to defend climate pact
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