other forms of metal exports along with textile produce much a significant amount of income and are expected to surpass the income brought in by petroleum and natural gas exports within the next 40 to 60 years. Government projects include the Burj Khalifa, which is the world's tallest building, Dubai World Central International Airport which, when completed, will be the most expensive airport ever built, and the three Palm Islands, the largest artificial islands in the world. Other projects include the Dubai Mall which is the world's largest shopping mall, and a man-made archipelago called The World which seeks to increase Dubai's rapidly growing tourism industry. Also in the entertainment sector is the construction of Dubailand, which is expected to be twice the size of Disney World, and of Dubai Sports City which will not only provide homes for local sports teams but may be part of future Olympic bids. However, this is concern that this construction boom has been built on debt and speculation, with little creation of true economic value.
Major increases in imports occurred in manufactured goods, machinery, and transportation equipment, which together accounted for 80% of total imports. Another important foreign exchange earner, the Abu Dhabi Investment Authority – which controls the investments of Abu Dhabi, the wealthiest emirate – manages an estimated $360 billion in overseas investments & an estimated $900 billion in assets.
More than 200 factories operate at the Jebel Ali complex in Dubai, which includes a deep-water port and a free trade zone for manufacturing and distribution in which all goods for re-export or transshipment enjoy a 100% duty exemption. A major power plant with associated water desalination units, an aluminium smelter, and a steel fabrication unit are prominent facilities in the complex. The complex is currently undergoing expansion, with sections of land set aside for different sectors of industry. A large