Trump says he is withdrawing the US from the Paris climate agreement again

President Donald Trump says he will again withdraw the United States, a top carbon polluting nation, from the landmark Paris climate agreement – dealing a blow to worldwide efforts to combat global warming.

The White House announcement, which came as Mr Trump was sworn in on Monday for a second term, echoed Mr Trump’s actions in 2017, when he announced that the US would abandon the global Paris accord.

The pact is aimed at limiting long-term global warming to 1.5C above pre-industrial levels or, failing that, keeping temperatures at least well below 2C above pre-industrial levels.

The 2015 Paris agreement is voluntary and allows nations to provide targets to cut their own emissions of greenhouse gases from the burning of coal, oil and natural gas.

The outgoing Biden administration last month offered a plan to cut US greenhouse gas emissions by more than 60% by 2035.

Laurence Tubiana, CEO of the European Climate Foundation and a key architect of the Paris agreement, called the planned US withdrawal unfortunate but said action to slow climate change “is stronger than any single country’s politics and policies”.

The global context for Mr Trump’s action is “very different to 2017″, Ms Tubiana said, adding that “there is unstoppable economic momentum behind the global transition, which the US has gained from and led but now risks forfeiting”.

The International Energy Agency expects the global market for key clean energy technologies to triple to more than two trillion dollars by 2035, she said.

“The impacts of the climate crisis are also worsening. The terrible wildfires in Los Angeles are the latest reminder that Americans, like everyone else, are affected by worsening climate change,” Ms Tubiana said.

Gina McCarthy, who served as White House climate adviser under ex-president Joe Biden, a Democrat, said that if Mr Trump, a Republican, “truly wants America to lead the global economy, become energy independent and create good-paying American jobs,” then he must “stay focused on growing our clean energy industry. Clean technologies are driving down energy costs for people all across our country.”

The world is now long-term 1.3C above mid-1800s temperatures.

The withdrawal process from the Paris accord takes one year. Mr Trump’s previous withdrawal took effect the day after the 2020 presidential election, which he lost to Mr Biden.

While the first Trump-led withdrawal from the landmark UN agreement — adopted by 196 nations — shocked and angered nations across the globe, “not a single country followed the US out the door”, said Alden Meyer, a long-time climate negotiations analyst with the European think tank E3G.

Instead, other nations renewed their commitment to slowing climate change, along with investors, businesses, governors, mayors and others in the US, Mr Meyer and other experts said.

Still, they lamented the loss of US leadership in global efforts to slow climate change, even as the world is on track to set yet another record hot year and has been lurching from drought to hurricane to flood to wildfire.

“Clearly America is not going to play the commanding role in helping solve the climate crisis, the greatest dilemma humans have ever encountered,″ climate activist and writer Bill McKibben said before the withdrawal was formally announced.

“For the next few years the best we can hope is that Washington won’t manage to wreck the efforts of others.”

China several years ago passed the United States as the world’s largest annual carbon dioxide emitting nation. The US — the second biggest annual carbon polluting country — put 4.9 billion metric tons of carbon dioxide in the air in 2023, down 11% from a decade earlier, according to the scientists who track emissions for the Global Carbon Project.

But carbon dioxide lasts in the atmosphere for centuries, so the United States has put more of the heat-trapping gas that is now in the air than any other nation.

The US is responsible for nearly 22% of the carbon dioxide put in the atmosphere since 1950, according to Global Carbon Project.

While global efforts to fight climate change continued during Mr Trump’s first term, many experts worry that a second Trump term will be more damaging, with the United States withdrawing even further from climate efforts in a way that could cripple future presidents’ efforts.

With Mr Trump, who has dismissed climate change, in charge of the world’s leading economy, those experts fear other countries, especially China, could use it as an excuse to ease off their own efforts to curb carbon emissions.