Deep cold comes with pluses for some

Stepping out your southern Alberta door in the morning these frigid days, it may be hard to see any positives about the weather, but in fact, the deeply demoralizing arctic cold carries with it a few less-than- obvious pluses, says a City of Calgary biologist. According to Chris Manderson, who manages's the city's urban ecosystem, frigid weather helps control a variety of pests and diseases, particularly for trees.  That's because the elm bark beetle is one species that can be killed off by