Neil Clarke was overwhelmed. The editor and publisher of Clarkesworld, a prestigious online magazine that publishes science fiction, was drowning in submissions. But the number of stories being sent in wasn’t the problem; it was the fact that most of them had been written by AI tools like ChatGPT instead of by human authors.  Clarke, who lives in New Jersey , had spent most of last week weeding out the spammy submissions, but now, they were pouring in faster than he could keep up. On Monday, after getting more than 50 AI-generated stories before noon, he did something he had never done before in Clarkesworld’s 17-year-old history: He closed new submissions indefinitely.  It got to the point, Clarke said, where “I was dreading opening the submissions system.…