> one acre of managed forest can produce about thirty square meters of the 20-inch-thick panels mentioned in the article per year. > I'll guess it takes around

> one acre of managed forest can produce about thirty square meters of the 20-inch-thick panels mentioned in the article per year. > I'll guess it takes around four of those acre-year units to build one person's worth of an apartment building. France has about 30 million acres of privately held forest. Let's assume that half of this surface produces at your estimated rate, and 20% of that production goes to building: that would be about 3 million acres or 750.000 new individual units per year. With about 775-800k births in recent years, this would be fine.