Managua, Nicaragua — Nicaragua has signed the Paris climate deal, the country’s vice president confirmed on Monday, leaving the United States and Syria as the only two nations to not lend their support to the international treaty.

Rosario Murillo said that President Daniel Ortega had signed the Central American nation on to the deal even though the government still had misgivings about it.

In a joint letter to the United Nations, published online by Nicaraguan newspaper El 19, Murillo and Ortega said that although the Paris deal was “not ideal” it was the “only instrument” to prevent contamination that was poisoning the planet.

Adopted by nearly 200 countries during a conference in Paris in December 2015, the document lays out a 31-page plan that seeks to keep global average temperature rise to below 2 degrees Celsius, limit greenhouse gas emissions and also remove them from the atmosphere.

President Donald Trump announced on June 1 that he would withdraw the United States from the Paris climate agreement, but he also left open the door to negotiating a better deal for U.S. businesses and workers.