While the speech on the White House lawn was still happening Thursday, SpaceX and Tesla CEO Elon Musk, who said a day earlier that he would depart President Donald Trump's advisory councils if the US backed out of the Paris Agreement to curb greenhouse emissions, made good on his word.
"As a small country, we have also staunchly supported the rules-based multilateral system, and upheld the critical role of diplomacy in solving problems on the global commons". "Fighting climate change means fighting for all those affected by worsening air quality, extreme heat, eroding coastlines - issues that will continue to impact residents for generations to come".
While stating that France does still believe in the United States, he did present a potentially risky future ahead if nothing is done to combat climate change.
Obama said Thursday that Trump's rejection of the accord places the USA among "a small handful of nations that reject the future".
Cook joins a growing chorus of business and Silicon Valley executives panning the president's decision to pull the USA out of the accord.
The United States' commitments included reducing greenhouse gas emissions 26 to 28 percent below the country's 2005 levels by 2025, as well as providing aid to help less-developed countries reduce their carbon footprint.More news: Big games like these' - Andrew Fifita on NSW dominant win over Maroons
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"I tell you firmly tonight: We will not renegotiate a less ambitious accord".
Trump's controversial decision deals a blow to one of Obama's legacy accomplishments.
A letter signed by 25 major US firms runs as a full-page ad in Washington, D.C. newspapers on Thursday, part of a last-ditch effort to convince Trump that sticking with the agreement would be better for the economy.
Trump, tapping into the "America First" message he used when he was elected president previous year, said the Paris accord would undermine the US economy, cost U.S.jobs, weaken American national sovereignty and put the country at a permanent disadvantage to other countries such as China.
"We'll be the cleanest", he said.
On Thursday, Trump made good on his campaign promise to pull out of the Paris climate change agreement, a 2015 global pact to combat global warming signed by 195 nations.