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The reasons for the other two holdout countries were fair. Nicaragua's leaders felt the accord was not strong enough to fight climate change. Syria has been embroiled in a full-scale civil war for six years.
A Syrian delegate at the Bonn climate talks did not offer an explanation for the government's decision to ratify the pact, the New York Times reported. Syria, which produces only a small percentage of global emissions, has not yet submitted its targets for cutting greenhouse gases.
The U.S., under President Trump, is now completely alone in this global consensus to limit temperature rise to well below 2 degreesC to avoid dangerous climate change.
Under the terms of the Paris agreement, the earliest the U.S. can officially exit the pact is the day after the 2020 election.
"The bottom line is that the Paris accord is very unfair at the highest level to the United States," Trump said about the Paris withdrawal.
The United States remains firm in its position, according to White House spokeswoman Kelly Love, who pointed reporters to a prior statement the administration issued after Nicaragua joined the pact, the Times reported.
"As the president previously stated, the United States is withdrawing unless we can re-enter on terms the are more favorable for our country," the statement said.