Relentless climate change will make devastating blazes more likely; urbanisation in woodland areas will make them more costly. Prevention measures could help—if updated and widened. “Anti-vaxxers” may undermine coming covid-vaccination efforts; we examine the history of a baseless and dangerous movement. And things turn nasty among the biker gangs of northern Europe. For full access to print, digital and audio editions of The Economist, subscribe here www.economist.com/intelligenceoffer

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