Former Texas Gov. Rick Perry laughs at his Energy Secretary confirmation hearing. REUTERS/Carlos Barria ROME (AP) — Top energy officials from the Group of Seven industrial nations failed to agree on language for a joint declaration on Monday because of the U.S. administration's review of policies related to climate change and the reduction of greenhouse gases.

Italy's economic development minister, Carlo Calenda, told a news conference that those areas remained "key priorities for other G-7 countries and the EU" but that the United States "reserves its position" while the review is underway.

"Therefore it was not possible to sign a final joint declaration, since it would not cover the whole range of topics in the agenda," he said.

Energy Secretary Rick Perry led the U.S. delegation to the talks that were being closely watched by climate change activists after President Donald Trump signed an executive order that was part of his pledge to undo much of his predecessor's efforts against global warming.

While campaigning for president, Trump pledged to "cancel" the Paris Agreement, the first international deal to curb greenhouse gas emissions from both rich and poor countries. President Barack Obama enthusiastically supported the agreement, which was adopted by the U.S. and more than 190 other countries in 2015.

Another official at the talks, who spoke on condition of anonymity because he is not the official spokesman of his delegation, said the meeting failed to agree on a draft joint statement because it included a reaffirmation of commitments made under the Paris Agreement.

"Perry and his team were not ready to accept that, mainly on the argument that they are reviewing their policies and have not yet taken a position on the Paris Agreement," he said.

There was no immediate response to a request for comment from the U.S. delegation.

Trump's order launched a review of the Clean Power Plan, Obama's effort to restrict greenhouse gas emissions from coal-fired power plants. Trump also lifted a 14-month halt on new coal leases on federal lands.

Hundreds of environmentalists arrange their bodies to form a message of hope and peace in front of the Eiffel Tower in Paris, France, December 6, 2015 Benoit Tessier/ Reuters EU Climate and Energy Commissioner Miguel Arias Canete noted that except for the United States, all G-7 nations joined the EU in reaffirming their determination to implement the Paris Agreement.

"We see climate action and the clean energy transition for what it is: a driver of jobs and economy growth, a moral imperative and a promise for a better future," he said.

Officials noted that said consensus was reached on cooperation to support energy security in Ukraine, the future role of natural gas and cybersecurity in the energy sector.

Greenpeace activists protested outside, calling on officials to maintain their commitments to reduce greenhouse gases under the 2015 Paris Agreement.