Senior government figures expressed dismay at U.S. President Donald Trump’s decision to pull out of the Paris climate pact, fearing wide-ranging implications.

“I was extremely disappointed by the U.S. decision, which amounts to turning its back on the wisdom of mankind,” Environment Minister Koichi Yamamoto said at a news conference on June 2.

After expressing regret over the U.S. decision, Chief Cabinet Secretary Yoshihide Suga said the government will continue to explore a way to work with the United States to fight global warming.

“We understand that the withdrawal was one of Trump’s pledges during the campaign, but we would like to continue to stress (to the United States) the importance of the Paris deal,” Suga said at a regular news conference the same day.

Nobuteru Ishihara, minister in charge of economic revitalization, said he feared that the U.S. withdrawal could lead to emerging economies pulling out of the 2015 pact.

“If that happened, it could ruin the framework (for tackling climate change) and have economic and social implications.”

Finance Minister Taro Aso was critical of the U.S. move, saying that the development of shale gas, which is abundant in North America, is the reason behind the decision.

He suggested that the United States has abandoned its leadership role of taking into account the overall benefit to the global community.

“The United States is no longer such a nation,” Aso said.