Police departments across the world know that violence spikes in hotter months and is higher in hotter climates. There are several explanations that include the suggestion that people who live in warmer places spend more time outside, and therefore are offered more opportunity for other people to annoy them. But the topic deserves attention as the world gets hotter. At Cambridge University a new theory has been developed: Climate aggression and self-control in humans (CLASH). CLASH is built on the fact that, in general, violence is higher in places closer to the equator. And while equatorial countries are hotter, they have another distinctive climate trait: The weather doesn’t change much. It’s always hot. At The Optimist Daily we also know the solution: In many studies, meditation has been shown to bring down violence in cities even during the hottest summer months.