"G7 countries have crucial roles and responsibilities to our own public opinion, to developing countries and to the planet," Italy's Environment Minister Gian Luca Galletti said at the start of a two-day meeting of G7 environmental chiefs. "The international community awaits our message."
Scott Pruitt, a friend of the oil industry who is sceptical about man-made climate change and was Trump's controversial choice to head the US Environmental Protection Agency, attended the meeting but was due to fly home after the first day.
Adding to the frustration of the Italian hosts, Britain was represented by a junior minister as efforts to form a new government in London continued.
Patricia Espinosa, the UN official in charge of implementing the Paris accord, stressed that Trump's pullout would not make any difference in the short-term.
"We've all registered with regret the US decision but at the same time the US remains a party to the agreement because it foresees a three year period before any party can withdraw.
Italy's large environmentalist movement had planned a demonstration against Trump's decision for Sunday afternoon in Bologna, an ancient university city and bastion of progressive activism.
"We are expecting a good turnout. A lot of people are very upset about Trump's decision and it has started a new debate," Giacomo Cossu, one of the organisers of the demonstration, told AFP.
Trump said Washington would not be bound by the targets on reducing emissions of greenhouse gases set down in Paris, and will cut funding for developing countries affected by climate change.
But many analysts say Trump's rhetoric may make little difference.
Important players in US industry and individual cities and states are already implementing changes aimed at meeting the targets laid down in Paris, where most of the world's countries agreed to try and cap global temperature rises at 2C above pre-industrial levels.
"The G7 countries have to have a cohesive approach," on climate change, Japan's Environment Minister Koichi Yamamoto told today's opening session.
Scientists warn that failing to contain climate change will have devastating consequences as sea levels rise and extreme storms, droughts and heatwaves become more common, endangering crops and fragile environments with knock-on effects in the form of new conflicts and mass fluxes of people escaping affected areas.
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