The Trump administration has formally told the United Nations that the US expects to pull out from the 2015 Paris climate agreement.
The State Department portrayed its communication as a “strong message” to the world, after Donald Trump’s choice in June to leave the pact.
“The State Department is telling the UN what the president already told the world on June 1 and it has no legitimate effect,” he said.
Mr Purvis said nations can’t pull back from new global settlements, including the Paris climate one, until the point when three years after they go into effect.
In the announcement, the department said it will keep on participating in worldwide negotiations on the present and future environmental change deals.
The following meeting is in Bonn, Germany, in November.
The statement reads Mr Trump is open to re-engaging in the Paris Agreement if the US can identify terms that are more favourable to it, its business, its workers, its people and its taxpayers.
Under the Paris Accord nations set their own national targets for cutting greenhouse gas emissions. That implies Mr Trump can think of various targets for the US than those set by former President Barack Obama.