French President Emmanuel Macron, however, said he thought "there was progress" and aired hope that the USA would stay aboard.
London [U.K.], May 27: The G 7 leaders, in their final communique, have said that the summit in Italy has failed to bridge differences over climate change after United States President Donald Trump remained non-committal over the Paris Agreement.
Trump, earlier in the day, rode the streets of Taormina in a golf cart as the leaders of France, Germany, Italy, Japan, Canada and the United Kingdom walked ahead of him. Plus, support for climate action is far reaching, with everyone from CEOs to Pope Francis calling for the U.S.to lead. "The G6 - the G7 minus Trump - fully recommitted to the Paris Agreement".
In its final communique, G7 leaders said US officials are "in the process of reviewing its policies on climate change and on the Paris Agreement and thus is not in a position to join the consensus on these topics".
The agreement, which former President Barack Obama affirmed past year, was adopted in December 2015 at a United Nations climate change convention and went into effect last November.
Reportedly speaking to the head of the Environmental Protection Agency in the USA, he said the country would drop its commitment to the Paris Agreement, which was signed in 2015 under Barack Obama.
His announcement came as a summit of G7 leaders in Sicily, Italy, was wrapped up in deadlock over the issue on Saturday, with United States partners voicing frustration at Trump's failure to commit to the deal aimed at stemming global warming.
Trump has repeatedly called global warming a hoax, while he pledged on the campaign trail to cancel the Paris "bad deal". He's spending time on the Paris agreement.
Iran refutes United States for urging policy shift
Rouhani, a moderate, struck a deal with world powers to curb the country's nuclear programme in return for sanctions relief. He wrote: "For almost four decades Tehran's measures have robbed the region, and the world over, of quiet and stability".
Despite Trump being indecisive, The White House has said that President Trump's mind had changed after listening to other world leaders.
Meyer said many US states, cities, and companies are moving forward on climate action while the Trump administration is "waffling" on the Paris Agreement.
In the aftermath of Trump's election victory, the chairman of the Turnbull government's backbench committee on the environment and energy, the Liberal MP Craig Kelly, said on Facebook the Paris agreement was now "cactus".
Trump and wife Melania also rode a golf cart with Saudi Arabia's King Salman bin Abdulaziz Al Saud through the corridors of the National Museum during the first stop on his tour.
A tough debate is expected on issues like trade and climate change, already raised in Brussels at talks between Mr Trump and European Union leaders on Thursday.
But Mattis, in an interview to air today on a CBS talk show, said Trump was "wide open" on the Paris climate deal. "He knows that Paris (deal) has important meaning to numerous European leaders".
The leaders of Tunisia, Ethiopia, Niger, Nigeria and Kenya will join the discussions on Saturday to say what should be done to encourage investment and innovation on their continent.