“This is a powerful vote of confidence in British goods, British services, Britain's economy and the British people and we look forward to building on these conversations in the months ahead.
“I approach it in an optimistic way and a very positive way – we’ve already started talking with the Americans.
It has been ratified by 153 United Nations Framework Convention on Climate Change members, and signed by 195.
But Ms May took a significantly less critical tone on Mr Trump when talking about trade, a sign that she is still relying on his support to make a success of Brexit.
The Trade Secretary was over in the US just a week or two ago talking to their trade minister about the opportunities.” French President Emmanuel Macron used the talks to announce he would host another round of follow-up Paris climate talks in December, putting him even further from the US on the issue.