The Trump administration notified the international community Monday that it plans to officially withdraw from the Paris climate accord next fall, a move that will leave the world’s second-largest emitter of greenhouse gases as the only nation to abandon the global effort to combat climate change.

President Trump has long criticized the 2015 accord and insisted that the United States would exit it as soon as possible. As recently as last month, Trump called the agreement “a total disaster” and argued that the Obama administration’s pledges to cut carbon emissions under the deal would have “hurt the competitiveness” of the United States.

In a statement, Secretary of State Mike Pompeo said the administration had sent official notification of its plans to the United Nations.

“In international climate discussions, we will continue to offer a realistic and pragmatic model — backed by a record of real world results — showing innovation and open markets lead to greater prosperity, fewer emissions, and more secure sources of energy,” Pompeo said. “We will continue to work with our global partners to enhance resilience to the impacts of climate change and prepare for and respond to natural disasters.”