Al Maktoum International Airport, located in Jebel Ali, Dubai, is the largest greenfield airport project currently under construction in the world. By 2013, it is expected to handle more freight—up to 12 million tonnes per year—than any other cargo airport in the world. The first of the airport's five 2.8-mile-long runways opened in June 2010, and the first of 16 cargo terminals has been completed. Expected to open next year, a passenger terminal capable of handling seven million passengers annually is now complete and undergoing testing. Two additional passenger terminals are in the design stage. Three cargo carriers are now
The 2016 Summer Olympics boating and swimming events have put an international spotlight on what has been a long-running problem in Rio de Janeiro—untreated sewage and trash are clogging up major bays and waterways.