Today, around half of the world's population lives in cities. But when you grow up, cities may become more crowded(拥挤的). By 2050, 68 percent of the world's population may live there. What might your life look like in the future?
Supersonic airplanes(超音速飞机)
Supersonic airplanes came out in the 1960s. But they were too noisy to use. Now, US company Boom will make better airplanes of this kind. They fly higher than usual airplanes. This makes the flight more stable. Also, supersonic airplanes are quieter and faster. Now it takes you more than 11 hours to fly from Beijing to Seattle. With a supersonic airplane, it will be just 5 hours!
Flying taxis and buses
Many companies are working on flying cars. Japan's SkyDrive is one of them. Its car has only two seats for a pilot and a passenger. It runs on electricity and flies about 10 kilometers per charge. It helps to cut traffic jam(交通堵塞).
Underwater highways
Besides "flying" in the air, we might also move around underwater. These highways are under water tubes. People sit in pods(舱). They can travel between the UK and countries in Northern Europe in less than an hour. Usually, it takes around two hours.
