Jason Momoa is as concerned about this planet as his “Aquaman” superhero counterpart is.

The actor made his first appearance at the United Nations headquarters in New York on Friday. Momoa spoke on behalf of Hawaii and other island nations affected by climate change.

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“We, the island nations and all coastal communities, are the frontlines in this environmental crisis,” he said. “Entire islands are drowning into the sea due to the enormous volume of emissions generated by first world countries.”

“When the frontline is gone, we are doomed,” he continued. “There is no undoing.” The actor shared the speech on Instagram. “We’ve been half-a**ing our global efforts to reverse the climate crisis and this can’t continue,” he wrote in the post’s caption. “We have to change now.”

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This is not the first time Momoa, 40, has spoken out against environmental concerns. This summer, he was part of the public protests against the planned construction of the Thirty Meters Telescope in Manua Kea, Hawaii.

Momoa will star in the new Apple TV+ series “See”, which will premiere when the streaming service launches on Nov. 1.