Leonardo DiCaprio has long been a strong advocate for the environment, and today the star took to Twitter to voice his disapproval over Donald Trump’s decision to abandon the Paris climate accord in a pair of tweets focusing on the president’s decision.

“Today, our planet suffered,” DiCaprio wrote in the first tweet. “It’s more important than ever to take action.”

DiCaprio followed up that tweet with another tweet urging Americans to take action against man-made climate change by supporting organizations that DiCaprio describes as being on the “front lines of this fight,” such as Indivisible, Stand Up America, and Natural Resources Defense Council.

Donald Trump’s decision to leave the Paris climate accord is not a surprise, as Trump campaigned on a promise to withdraw the United States from the agreement, according to NPR. Trump explained his decision as being influenced by what he sees as the best economic interests of the United States, describing the Paris climate accord as a scheme to funnel wealth out of the United States.

“The agreement is a massive redistribution of United States’ wealth to other countries,” Trump said. “It’s to give their country an economic edge over the United States. That’s not going to happen as long as I’m president, I’m sorry.”

Leonardo DiCaprio is not alone in condemning Trump’s decision to withdraw the United States from the Paris agreement. One of the organizations that DiCaprio mentioned in his tweet, the Natural Resources Defense Council, tweeted its condemnation of the move in frank and direct terms.

BREAKING: President Trump announced his decision to withdraw the U.S. from the #ParisAgreement. This is a foolish & reckless mistake. pic.twitter.com/jQan84TsvB — NRDC (@NRDC) June 1, 2017

Leonardo DiCaprio also retweeted former President Joe Biden, who is harshly critical of President Trump’s decision, describing climate change as an “existential threat to our future.”

Climate change is an existential threat to our future—staying in #ParisAgreement is the best way to protect our children & global leadership — Joe Biden (@JoeBiden) May 31, 2017

According to NPR, the Paris climate agreement was signed in 2015 and came about as a result of a hard-fought diplomatic fight. The agreement asks that signing nations voluntarily cut carbon emissions and to keep the rise in global temperatures no higher than two degrees Celsius. Only two nations abstained from signing the agreement, Nicaragua and Syria, making the United States only the third nation in the world to not be aligned with the agreement if all goes according to Trump’s plan.

Leonardo DiCaprio supports the Paris climate accord. [Image by Thierry Chesnot/Getty Images]

And therein lies the catch: the decision by Donald Trump for the United States to leave the agreement will not go into effect until the day after the 2020 United States Presidential election, according to Newsweek. The move will no doubt be a hot issue for the 2018 mid-term elections and the 2020 presidential election. Numerous Democratic mayors and governors have come out saying that their cities and states will stick to the terms of the Paris agreement in spite of Donald Trump’s decision.

If Washington won't act, New Yorkers will. We've set bold renewable energy goals and will invest in a sustainable future. #ParisAgreement. pic.twitter.com/wj6vCbj2aq — Andrew Cuomo (@NYGovCuomo) May 31, 2017

As the Mayor of Pittsburgh, I can assure you that we will follow the guidelines of the Paris Agreement for our people, our economy & future. https://t.co/3znXGTcd8C — bill peduto (@billpeduto) June 1, 2017

Former Vice President Al Gore also issued a statement critical of Donald Trump’s decision.

My statement on Today’s Decision by the Trump Administration to Withdraw from the Paris Agreement: https://t.co/eDEFv5b1nS pic.twitter.com/SzHJU3D0Mr — Al Gore (@algore) June 1, 2017

Not everyone is joining Leonardo DiCaprio in being angry with Donald Trump for his decision to withdraw the United States from the Paris climate agreement. Many on the right see the Paris climate accord as an attack on American sovereignty, framing the decision as one of economic freedom and a move away from the globalist control of the U.S. economy.

.@michaelmalice on #ParisAgreement: "This is about obedience & submission of the American people & the American govt to a new world order." pic.twitter.com/bi5YELw5Qb — Fox News (@FoxNews) June 1, 2017

Leonardo DiCaprio and others who are deeply concerned about the environment will likely not be moved by these arguments. While voluntarily agreeing to abide by measures to reduce carbon emissions and roll back man-made climate change may, in fact, have an impact on business-as-usual in the United States, DiCaprio and others would argue that business-as-usual is a large part of the problem. Americans will decide in the coming years if, as a society, they favor an approach that aligns with the worldwide consensus that climate change is a serious issue that must be acted upon or if it should be largely ignored in favor of the economic arguments voiced by Trump and those who support his decision.

Withdrawing from the #ParisAgreement will be devastating to our planet. Paris and Pittsburgh share the same environment after all. pic.twitter.com/QNO5vHtmEF — Scott Kelly (@StationCDRKelly) June 1, 2017

[Featured Image by Chip Somodevilla/Getty Images]