Digested week: Greta Thunberg gives a masterclass in the art of protest | Emma Brockes

Also, an alcohol study sinks spirits, and the Velma series is a Scooby-Don't for TV critics

In a headline to sink one's already dismal January spirits, the New York Times presents a study into the effects of drinking with the alarmist summary Even a Little Alcohol Can Harm Your Health. This finding, contrary to previous scientific studies - clung to by many of us as to the edge of a cliff - asserts that, in fact, moderate red wine intake may not be good for the heart. Scrap that, says Dr Tim Naimi, director of the University of Victoria's Canadian Institute for Substance Use Research. Alcohol," he says, is harmful to the health starting at very low levels."