SurvivalBlog Graphic of the Week
Today’s graphic: Firewood Supply Versus Demand. (Graphic courtesy of Reddit. Map by Casey Peterson, based on 2021 PRISM OSU climate data.) The thumbnail below is click-expandable. — From the Reddit site: Heating demand is approximated using a Heating Degree Day proxy derived from PRISM 30-year mean annual temperature. The formula max(0, (18.3 – Tmean) * 365) estimates how much heating a location needs annually – 18.3°C (65°F) is the standard base temperature below which buildings require heating. Higher values mean colder climates with greater heating needs. This is a simplified annual approximation; true HDD uses daily …