Some scientists say these worries about attention are a moral panic, comparable to the anxieties in the past about comic books or rap music, and that the evidence is shaky. Other scientists say the evidence is strong and these anxieties are like the early warnings about the obesity epidemic or the climate crisis in the 1970s. I think that given this uncertainty, we can’t wait for perfect evidence. We have to act based on a reasonable assessment of risk. If the people warning about the effects on our attention turn out to be wrong, and we still do what they suggest, what will be the cost? We will spend less time being harassed by our bosses, and we’ll be tracked and manipulated less by technology – along with lots of other improvements in our lives that are desirable in any case. But if they turn out to be right, and we don’t do what they say, what’s the cost? We will have – as the former Google engineer Tristan Harris told me – downgraded humanity, stripping us of our attention at the very time when we face big collective crises that require it more than ever.