Architecture firm Rüdiger Lainer and Partner has unveiled plans to build the world’s tallest wooden skyscraper in the Seestadt Aspern area of Vienna. The 276ft, 24 story HoHo tower will house a hotel, apartments, restaurant, wellness center and offices, and 76 percent of the structure will be constructed from wood, which will save a phenomenal 2,800 tonnes of CO2 emissions over similar structures built out of steel and concrete.