“It takes an amazing team and support system to pull off something like this,” he wrote. “I am deeply grateful to my wife and children, my mother.”

Momoa called the experience “life-changing” in an Instagram post Friday.

The Hawaii-born “Aquaman” star, who is of Native Hawaiian descent, joined world leaders at the U.N. General Assembly to review the progress made by the SAMOA Pathway , a U.N. program adopted in 2014 that aims to address the unique environmental concerns impacting small island developing states .

Jason Momoa made an impassioned plea to the United Nations on Friday on behalf of the island nations of the world that are “drowning” due to the effects of climate change .

A post shared by Jason Momoa (@prideofgypsies) on Sep 27, 2019 at 10:05am PDT

In his speech, Momoa talked about the impacts of ocean plastic pollution and rising sea levels.

“Island nations contribute the least to this disaster, but are made to suffer the weight of its consequences,” he said. “Our governments and corporate entities have known for decades that immediate change is needed. Yet change still has not come.”

Momoa shared a video of his entire speech on Instagram, which he described as, “No BS. Nothing sugar coated, just straight from the heart.”

Momoa charged that humans are the “only species willing to force disharmony with the natural balance of our world.”

“We are the living consequence of forgotten traditions,” he added.

Momoa has been outspoken about the effects of climate change and ocean pollution on numerous occasions.

Last month, he used his social media platform to help spread awareness about the fires across the Amazon rainforest to his roughly 13 million Instagram followers.

Brazil’s National Institute for Space Research reported that the Amazon wildfires showed an 84% increase over the same period last year.

Watch a video clip of his entire speech at the U.N. below: