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The Paris Agreement is seen as the most important global climate agreement ever signed, with nearly 200 world leaders agreeing to protect the planet. It is also seen as one of the biggest achievements of Barack Obama's reign as president. However, Donald Trump is now set to pull the USA out in a move which will see America join Syria and Nicaragua as the only countries who do not support the deal.

REUTERS Jean-Claude Juncker warned Mr Trump that quitting the Paris agreement will take years

REUTERS Mr Trump announced his opposition to the Paris Agreement at the G7 summit

A White House source confirmed on Wednesday Mr Trump intends to pull out of the agreement and the president later tweeted he will announce his decision at 3pm this afternoon. But European Commission President Jean-Claude Juncker warned President Trump leaving will be much harder than he realises. Although President Trump could simply roll back US climate policy, he will still be tied into the commitment.

REUTERS The Paris Agreement is one of Barack Obama's biggest successes

REUTERS The Paris Agreement is seen as the most important global climate agreement ever signed

The climate deal says: It takes three, four years after the treaty took effect last November to exit the agreement. Jean-Claude Juncker

Mr Juncker said: “The climate deal says: It takes three, four years after the treaty took effect last November to exit the agreement. “That means the idea that you can simply disappear into thin air — that won’t happen. “The law is the law, and everyone has to stick to it. “Not everything which is law, and not everything which is written in international treaties, is fake news. You got to stick to that.”

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The deal came into force on November 4 last year, and the agreement stipulates that a withdrawal can legally only be filed after three years - meaning the very earliest date Mr Trump can quit is November 4, 2019. Then, following withdrawal, the exit will only legally become effective one year after that date - on November 4, 2020. But in a bizarre twist, if Mr Trump did decide to pull out of the deal then the exit will come the day after the next US Presidential election. The president had previously dismissed climate change as a hoax and a scam.

REUTERS The president had previously dismissed climate change as a hoax