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 has wasted no time dismantling climate policies and promising a new era of fossil-fuel dominance, withdrawing the US from the Paris Agreement on his first day back in office.

The Paris agreement is complex and works in a slow bureaucratic manner. It’s a mostly voluntary climate pact originally written in ways that would both try to reduce a worsening climate change problem and withstand the changing political winds in the United States.