racism and classism are too enmeshed with one another to separate. if there is an issue in which wealth disparity is involved (i.e. elon musk's inescapable, one-way indentured servitude contracts to build a space resort for the mega-rich), it will also involve racism (i.e. the people who are more likely to be indentured and exploited will be people of color, and the people more likely to treat mars as an escapist survivalist vacation will be white people).

there is also the huge issue of racism in how we approach climate change, and how climate change will negatively impact people of color disproportionately while white people are more likely to bounce back from disaster, escape to safer areas, or just say "fuck earth, i'm out" and give up on investing in sustainable life on earth while they go play out their unsustainable scifi fantasies.

search for terms like "environmental racism" and "climate change, racism" to learn more. there's loads of good writing and research on the topic.