Almost 200 countries are part of the accord and have agreed to fight global warming by reducing carbon emissions.
In spite of that decision, civic leaders across the US have pledged to do their part to honor the Paris accord.
Pelosi said climate change is "the challenge to this generation" and her "flagship issue".
Former S.C. Gov. Nikki Haley, now the USA ambassador to the United Nations, took a different approach on the issue.
And so, in pulling the U.S. from the Paris Climate Agreement, supported in the name of saving the planet by virtually all other countries, he puts himself first and puts this country on the path to isolation, mediocrity and eventual insignificance.
"Today, on behalf of an unprecedented collection of U.S. cities, states, businesses and other organizations, I am communicating to the United Nations and the global community that American society remains committed to achieving the emission reductions we pledged to make in Paris in 2015", said Bloomberg in a statement. "I know how tough these regulations President Obama put on us, because of the Paris Agreement, were on our businesses and our industries".
Staff writer Sarah Ellis contributed to this report. Under the auspices of the Mayors National Climate Action Agenda, the 211 (and counting) have committed to adopt the global climate agreement of their own accord.
Since Trump's announcement, many mayors and governors have been stepping forth to declare their continued commitment to fighting climate change. Bloomberg also plans to work with cities, states and businesses to set a collective emissions-cutting goal to submit to the United Nations as "America's Pledge" under the Paris accord.
The Trump administration's announcement undermines a key pillar in the fight against climate change and damages the world's ability to avoid the most unsafe and costly effects of climate change.
The coalition, calling itself "We are still in", includes leaders from nine states, 125 cities, 902 businesses and investors, and 183 colleges and universities.
"In the USA, it is local and state governments, along with businesses, that are primarily responsible for the dramatic decrease in greenhouse gas emissions in recent years", the signatories wrote. Twelve states and Puerto Rico have formed the U.S. Climate Alliance, all committing to uphold the Paris Accord.