Our warming climate is bad news for Christmas trees. Norwegian spruces risk getting cold feet as the insulating blanket of snow that protects their roots from Scandinavian winters thins.
Snow can be surprisingly cosy – acting like loft cladding to prevent sub-zero air penetrating the soil. Less of the white stuff means frigid soil that takes longer to thaw in spring. This limits trees’ new growth and ultimately has a knock-on effect on health, says Sirkka Sutinen, from the Finnish Forest Research Institute.
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