Environmental activists have staged protests on a beach and at sea near the Sicilian hilltop town of Taormina, where leaders of the world's seven wealthiest democracies were meeting.
Numerous protesters carried flags or wore bandanas over their faces with the hammer and sickle symbol, a communist symbol.
Further isolating the United States as other world powers prepare to take on the crisis of climate change, President Donald Trump refused to commit to the landmark Paris Climate Agreement as the remaining G7 leaders reaffirmed their determination to implement the accord.
Asked about the comments Friday, a spokesman for Germany's environment ministry says "we expressly don't share the view that protecting the climate harms economic growth". "I saw someone who listens and who is willing to work".
TAMARA KEITH, BYLINE: Coming in, there was a deep divide among the G-7 leaders. Macron won the French presidency on May 7.
Trump's pending review of US climate policies and decision not to make up his mind before the Taormina summit has braced environmentalists for the possibility of bland language that says little after years of increasingly stronger commitments to reduce reliance on fossil fuels and emissions under the Paris Agreement. "Now it's time for Trump to make the right decision".
"Coal does not even really make that much sense anymore as a feedstock", Mr Cohn told reporters traveling aboard Air Force One. She said the discussion was conducted in a very "honest" atmosphere, leading to a "very intense exchange". French President Emmanuel Macron, Italian Prime Minister Paolo Gentiloni and British Prime Minister Theresa May will also be attending the elite club for the first time, although May is expected to leave a day early because of the Manchester bombing.
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Gentiloni says: "Discussing is always useful".
The remarks went down badly with European leaders, who had hoped Trump would use the opportunity to confirm his commitment to Article 5, the core North Atlantic Treaty Organisation principle that an attack on one member is viewed as an attack on all. Macron added that he would be "demanding" in his exchanges with Putin. The US followed up by imposing sanctions that affected some of its G-7 allies.
But while Trump lectured some of the United States' strongest allies, he cozied up to the repressive regime in Saudi Arabia while pushing for the Arab world to root out extremism at home. "It is no secret that the leaders meeting [Friday] sometimes have different positions on topics such as climate change and trade".
The communique notes the Americans are, thus, "not in a position to join consensus" on climate change. Trump had called the global warming as a "hoax" during his election campaign and is threatening to pull the United State out of the 2015 Paris climate change deal. Trump also was impressed by their arguments about how crucial US leadership is in supporting global efforts.
But while officials signalled some progress on bridging differences about trade with the protectionist Trump, differences on the climate issue remained irreconcilable. Cohn stressed Friday that the president was simply being critical of the US trade imbalance with Germany.
Climate and trade were sticking points at the two-day summit in Taormina, Sicily.
German Chancellor Angela Merkel said the G-7 leaders "put forward very many arguments" for the US sticking with the agreement. The communique will specify that six of the seven countries back the 2015 Paris Agreement and that the United States had been given more time to decide on its stance.
For instance, the Trump administration started a review of fuel-economy standards for cars and light trucks, which along with other vehicles are the largest source of greenhouse gases in the U.S. And he set in motion a process to scrap a regulation forcing utilities to slash their carbon dioxide emissions.
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Still Cohn declined offers to predict what the president will decide. "If you know how it's going to go, then what's the point?" President Donald Trump is declaring that North Korea is "a world problem" but says "it will be solved ". "It will be solved ".
That, they say, explains the confrontational rhetoric despite the administration having yet to define exactly what it plans to do on either of those issues.
President Trump has said he will decide whether to pull the US out of the Paris climate accord when he returns from his trip.
G7 nations had hoped the USA leader, who has previously described climate change as a "hoax", would publicly back the Paris Agreement and the commitment to cut greenhouse gas emissions.
Trump's surprise announcement, in the form of a tweet on the final day of his lengthy global trip, comes after Trump declined to commit to staying in a sweeping climate deal, refusing to give into intense worldwide pressure.
Trump's pending review of US 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.
The White House had hoped to use Trump's five-stop trip as a moment to reset.
That idea was shot down ahead of the meeting. Schaefer says the European Union has no reason for "be sad about this, it's what makes us strong". The march was organized by unions protesting economic inequality, current migration policies and demanding lower military spending.
G7 communique acknowledges split with US on climate
And he abandoned his criticism of Saudi Arabia's human rights record following his warm welcome in the desert kingdom this week. German Chancellor Angela Merkel said "we put forward very many arguments" for the USA sticking with the agreement.