Just finished burning half of the firewood I split for this winter. Since it is toward the end of January, I think we'll make it to spring.
(This does not include my contingency cord of wood in the old shed) A cord of wood is a volume four feet by four feet by eight feet. ( 3.6 cubic meters)
So I wondered, on a long term sustainable basis, how many acres of woods does one need to heat their home in our climate?
We are at roughly N43 latitude, with pretty cold winters. ( It got down to -18F (-27C) yesterday, and they are forecasting -26F (-31C) for Tuesday night, but these are about as cold as it gets)
Tending outside chores was not too comfortable.
I did some googling at forestry and wood heating forums, and a rough average is 1/2 cord of wood per acre that can be harvested in perpetuity. There is obviously a wide range, depending on soil, rainfall and climate. Since we have been burning around three cords each winter, I need six acres (2.4 hectares) to heat our home.
In the rural areas of America, and here in Wisconsin, there are no natural gas pipelines, so most people heat with trucked in propane, though some regions heat with diesel fuel. And what about the cities, where by far the most people live? Natural gas is relatively cheap right now, but it will not last. There is a lot more to sustainable living than this but just the one example of home heating shows how precarious things could get.
I've been fortunate enough to afford buying land which has around 15 acres (6 hectares) of woods, so this home will be ok if fossil fuels fade, especially after I get more good quality trees planted. But what about everyone else? Even if they could afford the land, there is not enough for everyone.
This is an old photo from last fall. It is about 1.5 cords, or half of our annual firewood use. We currently have around eight inches of snow on the ground.