"Generations from now, Americans will look back at Donald Trump's decision to leave the Paris Agreement as one of the most ignorant and unsafe actions ever taken by any president", Sierra Club executive director Michael Brune said in a statement.
Sweden's United Nations ambassador says a US withdrawal from the Paris climate agreement would be "a disappointment to the rest of the world" and would hurt American interests.
Meanwhile, African nations are protesting Trump's decision. US inaction on greenhouse gases may eventually discourage other countries from continuing their own efforts to cut back, said Oppenheimer at Princeton.
In announcing his decision, Trump said he was "elected to represent the citizens of Pittsburgh, not Paris".
Trump's message appeared to preface further acrimony between himself and Merkel, the most powerful politician in Europe and, increasingly, the most vocal Trump foil on the continent.
The White House indicated it would follow the lengthy exit process outlined in the deal.
Almost every country has signed on to the Paris Agreement, and a majority have ratified it.
He is breaking from many of America's staunchest allies, who have expressed alarm about the decision. Several of his top aides have opposed the action, too, as has his daughter and adviser, Ivanka Trump.
Under former President Barack Obama, the USA had agreed to reduce emissions to 26 percent to 28 percent of 2005 levels by 2025 - about 1.6 billion tons.
Updates From LSU-Oregon Softball At WCWS
They will be vying for back-to-back titles when they play the previous back-to-back champions. Ocasio is a member of Puerto Rico's national team who ranks sixth nationally with a 1.13 ERA.
The emissions goals that each country sets under the Paris agreement are voluntary, and there is no penalty for failing to meet them.
Responding to Trump's pointing to his city, Pittsburgh Mayor Bill Peduto called the decision "disastrous for our planet, for cities such as Pittsburgh", and a step that "has made America weaker and the world less safe".
And Sweden's Climate Minister Isabella Lovin says "it would be deeply regrettable" if the United States decides to pull out of a landmark global climate agreement, adding "it is also contrary to what we expect from the USA leadership when humanity faces major challenges".
The immediate impact of Trump's move could be largely symbolic.
UN Secretary-General Antonio Guterres has said it was "absolutely essential" that the Paris climate agreement be implemented.
Abandoning the pact would isolate the US from a raft of worldwide allies who spent years negotiating the 2015 agreement to fight global warming and pollution by reducing carbon emissions.
If Trump won't listen to the tech industry, which in large part is driving the nation's economy, he should especially take note that powerful energy companies such as BP, Chevron, Exxon and Shell are also urging the president to sign on to the Paris Climate Agreement.
Congressional Republicans applauded the decision, with Senate Majority Leader Mitch McConnell of Kentucky saying Trump had "put families and jobs ahead of left-wing ideology and should be commended".
(AP Photo/Jeff Chiu). In this photo taken May 30, 2016, House Minority Leader Nancy Pelosi of Calif. speaks in San Francisco.
He went on to say he did not believe the USA should pull out of the Paris agreement. And the final decision may not be entirely clear-cut: Aides were still deliberating on "caveats in the language", one official said.
Investors seemed pleased, with stock prices, already up for the day, bumping higher as he spoke.
Trump's chief economic adviser, Gary Cohn, has discussed the possibility of changing the USA carbon reduction targets instead of pulling out of the deal completely.
Around the world, coal-fired power plants are being shuttered as governments and private companies invest billions in wind turbines and solar farms.
The national side's malaise is a mystery at first glance, given their star quality with various players in top European clubs. It's a boost for us to see how excited he is with this new stage (for Argentina).
The engine was still running and the vehicle had sustained damage on both bumpers, according to police. Woods asks what the case is about and repeatedly needs instructions to blow into the breath machine.
She said a white transit van had knocked several pedestrians over, estimating five or six casualties injured or seriously injured. One witness, Mark Roberts, told CNN he was on the bridge when a van came swerving down the roadway at a high rate of speed.
He's been the Predators' starting goalie since the 2008-09 season and has now become their most valuable playoff performer. Gill has been a season ticket holder since the inaugural season of 1998-99 and was on the committee to design the arena.
Neill Blomkamp's proposed Alien 5 is probably never going to happen, but that doesn't mean that Blomkamp is finished with sci-fi. Check out the Oats Studios website for... well, not MUCH more information, but presumably there will be more details there soon.
It wasn't clear if he said something to draw Christian's attention, but he stood up as Christian began shouting at him. And reportedly his last words according to one witness were, tell everybody on this train that I love them.
For New Zealand's captain, Kane Williamson , who top-scored on the day with a well-paced 100, the game was not completely wasted. Starc (0/52) went wicketless in his return to global cricket post the injury he suffered in India earlier this year.
Later Monday, it's expected to announce an internet-connected smart speaker to compete with Amazon's Echo and Google's Home . The research firm IDC says Apple and Xiaomi each has a worldwide market share of almost 15 percent in the first quarter.
USA and British intelligence officials have said that the explosive had a level of sophistication that suggested a larger network. Investigators are now focussing on the terrorist network they believe the 22-year-old Manchester-born suicide bomber was part of.
House panel issues subpoenas for Flynn, others
The committee has ordered lawyer Michael Cohen and security adviser Michael Flynn to appear before them and supply documents. There is disagreement about whether those three subpoenas were issued without the knowledge of committee Democrats.
New smart speaker expected as Apple kicks off conference
HomePod will go on sale in December in Australia, the U.S. and the United Kingdom and will cost American consumers $349 (A$465). You can activate it with a wake word - "Hey Siri" - and ask an artificially intelligent assistant, Siri, to play music.
What was James Comey thinking when he met with Trump?
Executive privilege is a legal loophole that allows the president to withhold information from other government branches. Trump also said in an interview that he was thinking of "this Russian Federation thing" when he chose to fire Comey.
Yankees smash Blue Jays in record-tying fashion
The Blue Jays tacked on two more runs against Pineda with a third inning sacrifice fly and fourth inning wild pitch. The young closer boasts a 2.78 ERA, 0.84 WHIP, and 29/2 K/BB ratio in 22 2/3 innings this season for the Jays.
MTV will livestream Sunday's Manchester benefit concert
Musicians including Justin Bieber , Katy Perry , Coldplay , Take That and Miley Cyrus will join Grande for the concert. Who will the proceeds go to? Evie was with friend Millie in the foyer of the Manchester Arena when the bomb exploded.
Bill watch: Governor vetoes liquor bill
The governor's large vetoes were money for public schools that he vetoed as part of a budget deal he worked out with legislators. Scott said he had been having conversations with Corcoran and Negron for months and feels this process was necessary.
Osinbajo Speaks On The Ceding of Bakassi To Cameroon
Rahul Savara, MD, Chi Foods Nigeria, Dr. "Unity is absolutely important because God wants us to be united", Osinbajo said. According to him, the traditional institution had been the foundation of government.
Intel's new CPU has a insane 18 cores
At a time where 4 cored processors on PC are considered a standard, an 18 cored processor would change the game completely. Intel's Core X processing chips are set to release soon, within the 2nd quarter of this year.