@b92dcc07 
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"Black spruces are made to burn, filled with flammable sap and equipped with resin-filled cones that rely on fire, only opening and dropping seeds when they're heated. They're so flammable that firefighters call them "gas on a stick."

Planting neat rows of black spruces was great for the logging industry: the even spacing guaranteed that when the trees matured, they could be easily reaped, with ample space between each near-identical tree for massive shears to operate."  1/2