President Donald Trump’s decision to pull the U.S. out of the Paris climate agreement has met with widespread dismay from the biggest names in technology.

The agreement has been ratified by 147 countries, yet Trump stated that signing it would result in the loss of millions of jobs for Americans and the sum of $3 trillion. He added that the U.S. would negotiate when a deal was fair. His decision has prompted some stern words and widespread disdain, with the European Union saying it was “a sad day for the world.”

The tech industry was unanimous in its disapproval. Tesla Inc. Chief Executive Elon Musk was quick to speak out and said he is no longer part of Trump’s Advisory Council. “Am departing presidential councils,” he tweeted. “Climate change is real. Leaving Paris is not good for America or the world.”

A letter was written in criticism of Trump’s decision, signed by 25 of the world’s biggest tech companies, including Apple Inc., Microsoft Corp., Google Inc. and Facebook Inc. “U.S. business is best served by a stable and practical framework facilitating an effective and balanced global response,” stated the letter.

Dear President Trump, as some of the largest companies in the US, we strongly urge you to keep the US in the Paris Agreement. pic.twitter.com/ztSXyYtRrm

— Marc Benioff (@Benioff) June 1, 2017

Facebook CEO Mark Zuckerberg let his feelings be known on his Facebook page, stating that not acting now to thwart climate change would be disastrous. “Withdrawing from the Paris climate agreement is bad for the environment, bad for the economy, and it puts our children’s future at risk,” said Zuckerberg, adding, “For our part, we’ve committed that every new data center we build will be powered by 100 percent renewable energy.”

Apple CEO Tim Cook joined in, tweeting on Thursday, “Decision to withdraw from the #ParisAgreeement was wrong for our planet. Apple is committed to fight climate change and we will never waver.” Google CEO Sundar Pichai wrote, “Disappointed with today’s decision. Google will keep working hard for a cleaner, more prosperous future for all.” And Microsoft President Brad Smith echoed these sentiments, stating, “We’re disappointed with the decision to exit the Paris Agreement. Microsoft remains committed to doing our part to achieve its goals.”

In a speech, Trump criticized what he called foreign capitalists and global activists “that have long sought to gain wealth from our country’s expense.” His decision, he said, amounted to putting “America first.”

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