Skyscraper shorter than the W350 Project despite having 10 more stories. Wooden skyscrapers are estimated to be around a quarter of the weight of an equivalent reinforced-concrete structure as well as reducing the building carbon footprint by 60–75%. Buildings have been designed using cross-laminated timber (CLT) which gives a higher rigidity and strength to wooden structures. CLT panels are prefabricated and can therefore speed up building time. Skyscraper A skyscraper is a continuously habitable high-rise building that has over 40 floors and is taller than approximately . Historically, the term first referred to buildings with 10 to 20 floors in the
Compton's Encyclopedia in 2002. Britannica had sold its Compton's interests to the Tribune Company in 1993, and for a time "Compton's Encyclopedia" was a product of The Learning Company, which purchased Brøderbund in 1998. In March 2002 Encyclopædia Britannica, Inc. "acquired an exclusive license to publish and distribute "Compton's Encyclopedia" in print and CD-ROM from Broderbund LLC and Success Publishing Group". Britannica's 1989 "Compton's Multimedia Encyclopedia" was the first "multimedia" CD-ROM encyclopedia. It won the 1991 Software Publishers Association Excellence in Software Award for Best Education Program. Grolier's 1985 "Academic American Encyclopedia on CD-ROM" was text-only. In 1990, when it was called