Erin Brockovich knows a thing about hidden costs. The activist who took on a utility giant over contaminated water decades ago now targets another industry racing to build at breakneck speed. Data centers. Those hulking facilities that power artificial intelligence and cloud computing. But many communities see them arrive with little warning and even less information. Brockovich launched a website last month complete with an interactive map. It lets residents flag proposed or existing data centers near them. The response surprised even her. What began with about 30 reports swelled to nearly 4,000 submissions within weeks. The map now shows more than 2,700 pins across 49 states. TechCrunch reported . “The single most common concern — more than noise, more than water usage, more than rising utility bills — is the one word that keeps appearing in submission after submission: transparency,” Brockovich wrote in a post on her Substack, The Brockovich Report . Residents describe feeling silenced. Ignored.…