On his first day back in office as United States president, Donald Trump gave formal notice of his nation's exit from the Paris Agreement—a vital global treaty seeking to rein in climate change.

Trump signed an executive order that begins the process of withdrawing from the Paris Climate Agreement, which he also did during his first term.

When Trump announced the U.S. withdrawal from the climate agreement in 2017, the move reverberated around the globe. Nearly 200 nations had committed to reducing greenhouse gas emissions under the pact when it was created in 2015, and they had set ambitious targets to keep global temperature rise well below 2°C, and ideally below 1.5°C.

Michael Bloomberg’s philanthropic organization and others are stepping in to maintain US contributions to the agency tasked with implementing the Paris Agreement.

Trump’s day-one actions on energy come as climate change-fueled fires ravage Southern California, following the globe’s hottest year on record.

Various European leaders reacted to President Donald Trump’s withdrawal from the Paris Agreement saying that they will stick to the landmark Paris climate agreement even though the United States has w

The White House announces a "national energy emergency" to reverse US climate regulations and boost oil and gas.

President Donald Trump has signed an executive order directing the United States to again withdraw the United States from the landmark Paris climate agreement.

The world’s largest economy and second-largest emitter of greenhouse gases will withdraw from the global climate pact, disrupting efforts to tackle climate change

This marks the second time Bloomberg, the former mayor of New York, has stepped in to fill the gap left by U.S. federal disengagement.

President Trump again withdrew the U.S. from the Paris Climate Agreement, a worldwide pact that aims to fight global warming. CBS News national environmental correspondent David Schechter reports on the move and its impact.