It is a pact that is part of the United Nations Framework Convention on Climate Change, which started in 1992 with the Rio Earth Summit. Technically, the Paris agreement itself is not a treaty so its adoption by America did not require U.S. Senate approval.

Trump's executive order called for an immediate withdrawal from the Paris Agreement. The Agreement requires one year notice, but there's room for interpretation.

President Donald Trump said Monday he will again withdraw the United States from the landmark Paris climate agreement, dealing a blow to worldwide efforts to combat global warming and once again distancing the U.S. from its closest allies.