The mayor of New York City, Bill de Blasio, said on Monday that he has joined a group of U.S. mayors to say "No" to U.S. President Donald Trump's decision of withdrawing the United States from the Paris Agreement on climate change.

De Blasio said in an event titled "The Urban Resilience Summit 2017" in New York on Monday that there had been 350 U.S. mayors coming together to say "'No' to the president and 'Yes' to a future our children can thrive in."

Earlier this year, Trump announced that he had decided to pull the United States out of the Paris Agreement, a landmark global pact to fight climate change.

Calling the agreement "hamstrings" the United States while "empowers" other countries, Trump said the United States would begin negotiations to re-enter the agreement. However, he also indicated that re-entry may not be a top priority for his administration.

De Blasio said on Monday that the president's decision has "put this planet on a dangerous path to denial" and majors across the country has promised to step up efforts and adhere to the Paris Principles.

According to the major, "climate change is a dagger aimed straight at the heart of New York City".

He recalled a deadly hurricane called Sandy in 2012 that killed 44 people and caused more than 19 billion U.S. dollars in losses in New York. "We've experienced citywide blackouts, economic downturns and extreme rainfall."

The New York city government has laid out plans to combat climate change and its effects, wrote De Blasio in an article published on Monday's Crain's New York Business, a local news website.

The goal is to "lower greenhouse emissions 80 percent by 2050 and to build a network of parks around lower Manhattan to absorb floodwaters, and to create an innovative program to moderate pockets of extreme heat in certain neighborhoods that kill too many New Yorkers, especially the poor and the elderly," he wrote.