Representative Alexandria Ocasio-Cortez (D-NY) had a double-trouble callout on April 9 for people on the far-right. The congresswoman known as AOC has been a leader on the Green New Deal, a plan to tackle both climate change and economic inequity. But on Tuesday, she pointed out how efforts to ignore climate change and stoke fears about immigration are connected.

“The far-right loves to drum up fear and resistance to immigrants. But have you ever noticed they never talk about what‘s causing people to flee their homes in the first place?” she wrote on Twitter. “Perhaps that’s [because] they’d be forced to confront one major factor fueling global migration: Climate change.”

AOC is right. The environmental impacts of climate change and disaster-level events related to it are displacing people from their homes all across the planet. Many of these people are fleeing destroyed homes and livelihoods in the wake of climate change-related crises. But at the same time, it’s getting harder to seek refuge.

The necessity of migration when climate change hits home is all too real around the world. According to the Science and Development Network, people in Bangladesh have been forced to flee due to rising sea levels brought on by climate change. According to the European Council on Foreign Relations, it’s believed that a lack of protective infrastructure and a reliance on economic sectors vulnerable to climate change impacts migration in Africa. And Public Radio International reported last year that climate change-related droughts and other natural disasters are creating refugees from Central America, a region with migrants President Donald Trump is fond of attacking.

For those fleeing the devastation of climate change, the tricky business of crossing international borders complicates things in an era when leaders in the United States and several European countries are cracking down on immigration, even though U.S. companies like ExxonMobil and Chevron and European companies like Shell and BP have historically been among the highest polluters.

AOC’s tweet was issued in response to a video from a group called The Leap, an environmental justice organization that says it “makes system change irresistible.” Narrated by actress (and Teen Vogue cover star Nico Parker’s mom) Thandie Newton, the video breaks down how right-wing fear-mongering over immigration connects to right-wing denial of climate science.

“From wildfires in Alberta to hurricanes in Puerto Rico, climate change is one of the reasons many of us are forced to leave our homes in search of a safer place to live,” Newton says in the video. “We keep hearing that migration is a crisis, and it is, for the people affected. But did you ever notice that the same leaders denying climate change are the ones drumming up fear and hatred against migrants?”

“To win climate justice, we need to oppose racism,” Newton says. “We know the world’s wealthiest countries have burned most of the carbon that is driving climate change today. Asserting the rights of migrants affected by these storms, floods, and fires is a way of paying back our climate debts.”