In the middlle of the desert in Dubai exists the world's newest skyscraper.It the Burj khalifa(formerly Burj Dubai) which rises over818 meters.Built by a korean construction company. it is the tallest buiding in the world. But for how long will the Burj khalifa hold the title as the tallest skyscrper? Many critics say building these multi-billion dollar skyscrapers is unnecessary and causes traffic congestion.