That move put the country with Syria and Nicaragua as nations that were not part of the deal, though Nicaragua, which originally said that the agreement did not go far enough, announced last month that it has already submitted the paperwork to join.
This now leaves the United States as the only country in the world not to have committed to the Agreement - a list which includes current worldwide adversaries such as Russia, North Korea, and now Syria.
At the UN Climate Change Conference in Bonn, Germany today, Syria announced its intentions to join the Paris Climate Accord.
"Syria's decision shows the breadth of support for the Paris agreement", Alden Meyer, of the Union of Concerned Scientists, told Reuters of the moves by the government of Syrian President Bashar al-Assad. Tesla CEO Elon Musk resigned from Trump's business council in protest.
"There has been no change in the United States' position on the Paris agreement", explained White House spokeswoman Lindsay Walters in CNN's report. "Is he accusing them of somehow buying into a hoax?"
On Oct. 23, Nicaragua announced it would join the Paris accord, despite its previous reservations.
It will then take one year to fully withdraw, meaning the earliest the United States could officially withdraw is the day after the 2020 election.
The summit, spearheaded by French President Emmanuel Macron, will host more than 100 world leaders in France on December 12, according to The Associated Press.
On the same day that Syria announced its inclusion in the climate agreement, French authorities disclosed that Trump would not be invited to the global summit "Make Our Planet Great Again".
On Nov. 3, the Trump administration released its National Climate Assessment, a federal report that has been mandatory since 1990. The other big feature on McKenna's personal Twitter account is never-ending happy stories about renewable energy and government programs to address climate change, so much so that you would never know the government she represents claims the world faces an imminent, existential threat from global warming in which hundreds of millions of people will soon die.