the.com/firewood

sunlight from a decade ago, finally cashed in as heat

means Wood cut and dried for burning as fuel, typically in a fireplace, stove, or campfire.

from A plain Old English compound, joining 'fire' (fȳr) and 'wood' (wudu) — both words ancient and unchanged in spirit since the Germanic tongues, the kind of everyday term that needed no fancy borrowing because people have been feeding flames with branches for as long as they've had words at all.

seasoning time
freshly cut wood needs six to twelve months drying
density wins
oak burns longer; pine spits and clogs chimneys
old currency
medieval peasants owed lords bundles as rent
heat math
a cord can rival a barrel of oil
warms twice
once when you chop it, once when burned
for instance

appalachian hardwood harvests — west virginia and eastern kentucky supply over 2 million cords annually for heating and timber

amazon charcoal production — brazilian pig iron smelters consume over 9 million tons of charcoal yearly from deforestation

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