That is a good idea but we may not have the technology or the money to make a force field to cover the earth. Our current atmosphere can not be seen or controlled. Also, if we put a force field around the whole world, the sun would not be able to get through to keep us warm (think of winter ( cold and snow) all the time but no sun) and it would be really dark as well because the sun provides heat and daylight for us. Also, with a force field around the world, astronauts could not go out into space to explore and help us learn about planets and things. But it is still a good idea eapecially if we could turn the force field on and off when we wanted to. :)
