BOLOGNA: The United Statesinfo-icon' partners in the G7 club of wealthy democracies vowed on Sunday to pursue efforts to curb climate change despite a rift caused by the American withdrawal from the Parisinfo-icon accord.

"G7 countries have crucial roles and responsibilities to our own public opinion, to developing countries and to the planet," Italyinfo-icon's Environmentinfo-icon Minister Gian Luca Galletti said at a two-day meeting of G7 environmental chiefs in Italy. "The international community awaits our message."

Scott Pruitt -- a friend of the oilinfo-icon industry who is sceptical about man-made climate change and was Trump's controversial choice to head the USinfo-icon Environmental Protection Agency -- attended the meeting in northern city Bologna but was due to fly home after the first day.

With Germanyinfo-icon's environment minister, Barbara Hendricks, also departing early and Franceinfo-icon's Nicolas Hulot not arriving until Monday because of legislative electionsinfo-icon, there appeared little prospect of substantial bridge building on an issue which has caused significant tensions between Donald Trumpinfo-icon's administration and key US allies.

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.

"So for us it is really clear that what we need to do is to go forward with implementing the accord and helping countries translate their national programme into their development policies so we can get to 2018 and have a first assessment of where we stand," she said.

Hundreds of students marched through Bologna to protest the presence of the G7 ministers in the ancient university city, a long-standing bastion of progressive activism.

Organiser Giacomo Cossu said that Trump had given the radical environmentalist movement a shot in the arm, but said he would have been on the streets regardless.

"Trump has revealed the truth that lies behind the rhetoric of the G7 on the environment. They want changes that suit the interests of big businessinfo-icon.

That is not our model. Ecology for us means democracy and equality. They represent the one percent not the seven billion." Chaperoned by hundreds of riot police, the demonstration appeared to be passing off peacefully with protestors brandishing placards declaring: "There is no Planet B" and "They think the Kyoto protocol is a Japanese erotic film."