text: Limiting the use of cars is a very good thing. It helps the environment, and it helps make the world a nicer place.    NASA should explore Venus even thought there are going to be many danger on the trip because it will help them figure out if Venus was just like Earth long ago, and it would be a shorter time to travel then the other planets. They call Venus "Earth's 'twin' " because there are so many things on Venus that are just like to Earth which make you want to figure out if humans use to be able to live on it a long time ago.