Nowadays economy has developed faster and faster.Though it brings us development,meanwhile,it also brings us lots of problems.
　 For example,the transportation problems are serious in Guangzhou.Now,Guang zhou is a developed city and its traffic is convenient,but there are too many cars,bicycles and motorcycles on a very limited amount of road space.As a matter of that,traffic circulation in Guangzhou has groud to a halt.Also,these cars, bicycles and motorcycles are inefficient,polluting and fuel-consuming.In other words,it will restrict the economy development and harm to the surrouding.
　 All in all, economy development is a disaster to human.We can't develope it unlimited.