Al Qaeda chief Osama bin Laden was so concerned about climate change and cutting greenhouse gas emissions that he once wrote a letter to the American public asking them to help President Barack Obama fight climate change, which he described as “catastrophic,” Reuters reported Tuesday.

Reuters reported that in the letter, which was released Tuesday by the U.S. Office of the Director of National Intelligence, bin Laden called on Americans to launch “a great revolution for freedom” against corporate control of the financial sector and corporate lobbyists, which would free up Obama to make “a rational decision to save humanity from the harmful gases that threaten its destiny.”

Osama bin Laden

Osama bin Laden (AP)

The letter was found following the 2011 raid on the bin Laden hideout in Abbottabad, Pakistan, during which the Al Qaeda leader was killed.

Reuters reported that though undated and unsigned, U.S. intelligence officials believe it was written in 2009 by bin Laden.

U.S. intelligence officials believe bin Laden was the author of a separate letter to an aide about a proposed media campaign timed to the 10th anniversary of 9/11 that was to include a call to cut greenhouse gases.

“[T]he world should put its efforts into attempting to reduce the release of gases,” the letter stated. “This is a struggle between two of the largest cultures on Earth, and it is in the shadow of catastrophic climate conditions.”

In 2010, bin Laden aired his concerns about climate change in an audio message criticizing former President George W. Bush for not signing the Kyoto Protocol on carbon emissions.

“Discussing climate change is not an intellectual luxury, but a reality,” he said in the recording.

“All of the industrialized countries, especially the big ones, bear responsibility for the global warming crisis,” bin Laden added.

Another document released Tuesday was bin Laden’s handwritten will in which he claimed to have $29 million in personal wealth which he wanted to be spent “on jihad for the sake of Allah.”