In the spectrum of knotty problems, pollution is one of the toughest to unravel. It’s far easier for polluting factories to tuck themselves near neighbors that lack a unified voice — think poor areas that are glad to have the work — than it is to scrub out the toxins and VOC byproducts. So low-income and communities of color get to breathe and play in the filth. This is why environmental justice is not about hugging trees. It’s about creating a world that can sustain life in every neighborhood.