Norway has completed the frame of the world's tallest timber building, which is being lauded for being environmentally friendly and fire resistant.  The Mjos Tower, which is situated near and named after a lake located about 100km north of Oslo, saw its last beam hoisted by a crane this week.  At 85.4 m, it has 18 floors.  Promoters say that using wood, a renewable material, makes it possible to reduce carbon dioxide (CO2) emissions compared to concrete, which is the primary material of residential buildings in cities.  "Building ...