The protest took place in Giardini Naxos, a seaside town near Taormina, where the leaders had met for two days.
Trump ended his nine-day overseas trip, which stretched from the Middle East to the Group of Seven meeting in Taormina, Sicily, without holding a news conference to take questions from reporters.
The leaders had all left before the protest began.
President Donald Trump will make a decision next week on whether or not he will keep his campaign promise to withdraw the USA from the Paris climate agreement. He tweeted he will make a decision next week - but he did not, on behalf of US, join the rest of the G7 in reaffirming a commitment to implement the Paris agreement.
"[Abbas] assured me he's willing to reach for peace with Israel in good faith, and I believe he will".
It's not the first time the two have spoken. Macron won the French presidency on May 7.
Abe adds, "there is a danger it can spread like a contagious disease".
The decision whether the exit the accord has been among the most factious of the Trump administration.
"His views are evolving, he came here to learn", Cohn said.
German Chancellor Angela Merkel, who also crossed swords with Mr Trump on free trade at the G-7, complained that the US President was keeping his colleagues in the dark. Between allies, Macron said, there would always be differences, but they needed to be discussed and worked through. Trump's short-sighted actions could make the USA into a pariah state.
This speech comes as Trump departs the G-7 summit.
"We were all very clear about that and about the role of the Paris agreement".
That, they say, explains the confrontational rhetoric despite the administration having yet to define exactly what it plans to do on the key issues of trade and climate change.
On the other side, European leaders - and even Pope Francis - urged Trump to stick with the Paris agreement while the president attended the G7 summit.
Ireland may soon have its first gay Prime Minister
It remains to be seen how Tanaiste Frances Fitzgerald will vote, but sources say she will endorse her Dublin colleague. Mr Coveney did get a boost yesterday after TDs Hildegarde Naughton, Peter Fitzpatrick and Sean Barrett backed him.
Leaders from some of the world's most powerful countries issued a joint statement over the weekend, blaming Donald Trump and the United States for the group's failure to reach an agreement on climate change.
Trump promised on the campaign trail to "cancel" the Paris Agreement arguing that it hurts USA energy interests, but actually exiting the deal has proven more complicated than Trump portrayed it on the campaign trail.
Almost every nation that signed the 2015 agreement has agreed to curb greenhouse gas emissions.
The delay from the U.S.is being seen as an area for concern for advocates of global action to confront climate change.
On trade, the statement reiterated the leaders' commitment to keeping markets open to fighting protectionism.
He spent the bulk of his 25-minute remarks, delivered with the help of a teleprompter but partially improvised, focused on terrorism, saying the May 22 bombing outside an Ariana Grande concert in Manchester, which killed 22 people, and a deadly attack on Coptic Christians in Egypt on Friday stiffened the European leaders' resolve.
The gap between Trump and other G-7 leaders on climate underscored his isolation from Europe on some major issues.
Trump's third and final session at the summit will be a closed meeting with seven heads of state.
Trump returns to Washington as the lead Senate committee investigating Russian meddling in the 2016 US presidential election has requested information and documents from his campaign.
Trump tweeted that he would reveal his hand only next week as to whether he will keep the United States in the Paris accord, a global pact on curbing carbon emissions that he vowed to jettison when campaigning for the White House.
Trump was cajoled for three days - first in Brussels at meetings of North Atlantic Treaty Organisation and the European Union, then in Sicily for G-7 - but will leave Italy without making clear where he stands.
The president tweeted Saturday, "I will make my final decision on the Paris Accord next week!"
Trump's pending review of USA climate policies has left environmentalists bracing for the possibility of bland G-7 promises that say little after years of increasingly stronger commitments to reduce reliance on fossil fuels and cut greenhouse gas emissions. Trump has previously referred to climate change as a "hoax".