The president has been promising withdrawal for two years, and Monday was the time he started to fulfill his promise.
Donald Trump, president of the United States (US) has notified the United Nations (UN) of the US intention to withdraw from the Paris Agreement that it had signed in 22015 under Obama's presidency. In this case, the US became a signatory to the agreement but nearly immediately signaled that it didn't intend to pursue its responsibilities.
"Today we begin the formal process of withdrawing from the Paris Agreement", tweeted Secretary of State Mike Pompeo.
He said that the United States will "continue to offer a realistic and pragmatic model" in global negotiations. With new reports, including ones from agencies within the Trump administration, showing that climate change - and its consequences - are worse than previously predicted, this is not a time for backsliding on needed policies and changes to reduce emissions of greenhouse gases, which trap warm air around the Earth, leading to higher average global temperatures, more intense storms, increasing numbers of wildfires, and other deadly consequences. It also calls for developed countries to support developing countries in their efforts to build environmentally sustainable futures.
A total of 197 countries have signed the Paris accord, from tiny islands fearful for their continued existence to authoritarian North Korea and war-torn Syria.
The action, which came on the first possible day it could be issued under the accord's complex rules on withdrawal, begins a yearlong countdown to America's exit from the agreement, under which almost 200 nations pledged to cut greenhouse emissions and help poorer countries cope with the worst effects of an already warming planet.
The US and China emit more carbon dioxide in the atmosphere than any other country in the world.
The U.S.' decision to formally ratify the Paris Climate Accord was hailed as a breakthrough in worldwide climate change action.
Billionaire Michael Bloomberg, the UN Special Envoy on Climate Change, said his philanthropic organisation will continue funding U.S. participation at the upcoming climate change negotiations, to be held in Madrid after Chile withdrew as host. In the absence of US federal leadership on climate change, several Democratic states and municipal governments have sought to apply their own regulations curbing emissions and promoting renewable energy sources such as solar and wind.
The opposition Democrats slammed the Trump administration for the decision.
While cities and states across America from Seattle to Los Angeles, Maine, New York State, and even Washington, D.C., have announced individual plans to go carbon neutral in the decades to come, having little-to-no federal oversight is still not acceptable to many believers in climate change, including several architects.
When the US pull-out goes into effect next November, it will leave the coalition without the world's second-leading emitter of greenhouse gases, forcing other member nations to reconsider their strategies for achieving the goals set forth in the agreement.
House Speaker Nancy Pelosi has described the move as a "disastrous decision that sells out our children's future".
But Mr Trump's withdrawal could still leave a lasting mark, said Andrew Light, a senior fellow at the World Resources Institute and former adviser to the United States climate envoy under president Barack Obama.