Rep. Alexandria Ocasio-Cortez warned a crowd about the urgency of addressing man-made climate change on Monday at an event honoring the legacy of Dr. Martin Luther King Jr., which she warned would “destroy the planet” in a dozen years if humans do not address it.

“Millennials and people, you know, Gen Z and all these folks that will come after us are looking up and we’re like: ‘The world is gonna end in 12 years if we don’t address climate change and your biggest issue is how are we gonna pay for it?'” Ocasio-Cortez asked Coates.

Her remarks refer to a U.N.-backed climate report, published last year, that determined the effects of climate change to be irreversible and unavoidable if carbon emissions are not reigned in over the next 12 years.

Read more at The Hill.