Apple (AAPL)  CEO Tim Cook is the latest Silicon Valley luminary to speak out against President Donald Trump's decision on Thursday afternoon to pull the U.S. out of the Paris Climate Accord. 

Cook expressed his disappointment with Trump in an internal memo to Apple employees on Thursday, saying he spoke with Trump on Tuesday and tried to persuade him to keep the U.S. in the agreement, but that ultimately "it wasn't enough." After sending the memo, Cook tweeted from his personal Twitter account that Trump's move is "wrong for our planet." 

Decision to withdraw from the #ParisAgreeement was wrong for our planet. Apple is committed to fight climate change and we will never waver.

— Tim Cook (@tim_cook) June 2, 2017
The Apple chief was one of almost a dozen CEOs of large tech companies who denounced the decision. Firms including  Amazon (AMZN) and Facebook ( FB)  said they continue to support the global treaty and emphasized the importance of fighting climate change. Ahead of the decision,  Alphabet's ( GOOGL) Google, Facebook and Microsoft (MSFT) joined 21 other large U.S. companies in writing an open letter last month urging Trump to remain a part of the accord.

Tesla Motors (TSLA) CEO Elon Musk had threatened ahead of Thursday's decision that if Trump chose to exit the accord, he would quit being Trump's adviser. Shortly after the news broke, Musk said he would make good on his promise to leave Trump's business advisory council. 

Am departing presidential councils. Climate change is real. Leaving Paris is not good for America or the world.

— Elon Musk (@elonmusk) June 1, 2017
IBM (IBM) said in a statement that it will continue to support U.S. participation in the Paris Agreement, but that CEO Ginny Rometty will remain a part of Trump's Business Advisory Council. Intel  ( INTC) CEO Brian Krzanich also indicated that he will continue to work with the Trump administration despite his decision to exit the deal, according to  Politico

Facebook CEO Mark Zuckerberg wrote on his personal page that withdrawing from the Paris climate agreement is bad for the environment and the economy and it "puts our children's future at risk."

And Amazon said in a statement that taking action on climate change is a critical part of fostering "American competitiveness, innovation and job growth."

"Amazon continues to support the Paris climate agreement and action on climate change," said Amazon spokesperson Melanie Janin. "We remain committed to putting our scale and inventive culture to work in ways that are good for the environment and our customers."

Chip giant Intel  also said it will continue to back the treaty, as continue investing in renewable energy. 

"Climate change is a real issue, and we firmly believe that the US should continue to participate in the Paris Climate Accord," a spokesperson said in a statement. "Withdrawal won't change our investment in renewable energy, and we will continue to advocate for the U.S. to engage."

Microsoft's president and chief legal officer, Brad Smith, wrote an entire blog post on Trump's decision to withdraw from the Paris Agreement, noting that more than 190 countries still remain committed to it. Aside from the U.S., Nicaragua and Syria are the only other countries to have exited the agreement. Smith wrote in the post that the Silicon Valley giant reached out to Trump about his stance on the accord on several occasions. 

"We've sent letters to and held meeting on this topic with senior officials in the State Department and the White House," Smith wrote. "And in the past month, we've joined with other American business leaders to take out full-page ads in the New York Times, Wall Street Journal and New York Post, urging the Administration to keep the United States in the Paris Agreement."

"We are disappointed with today's decision by the White House to withdraw the United States from the landmark, globally supported Paris Agreement on climate change," he added.

Other executives including Google CEO Sundar Pichai, eBay  (EBAY) CEO Devin Wenig, Box (BOX) CEO Aaron Levie and General Electric  (GE) CEO Jeff Immelt also criticized the decision on Twitter. And HP  (HPE) and Dell (DVMT) later issued statements on Twitter in support of fighting climate change and against Trump pulling the U.S. out of the accord. 

Disappointed with today's decision. Google will keep working hard for a cleaner, more prosperous future for all.

— Sundar Pichai (@sundarpichai) June 1, 2017

Disappointed with today's decision on the Paris Agreement. Climate change is real. Industry must now lead and not depend on government.

— Jeff Immelt (@JeffImmelt) June 1, 2017

With so many things America needs to make substantial progress on, it's incredibly disappointing to see us regress in significant areas.

— Aaron Levie (@levie) June 1, 2017

Disappointed by decision on Paris Agreement. Facts and science matter. Won't change @eBay commitment to do our part on climate change.

— Devin Wenig (@devinwenig) June 1, 2017

In addition, Salesforce (CRM)  said in a statement that the company is committed to embracing sustainability in the face of Trump's decision.

"We are disappointed by the Administration's decision to withdraw from the Paris Agreement, as climate change continues to threaten our planet and global economies," the company wrote. "As powerful platforms for change, businesses must step up to protect the planet for future generations."

Jim Cramer and the AAP team hold positions in Apple, HPE, Facebook, Alphabet, General Electric for their Action Alerts PLUS Charitable Trust Portfolio. Want to be alerted before Cramer buys or sells AAPL, HPE, GOOGL, GEFB? Learn more now.

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