text: According to Elisabeth Rosenthal, cars make up "12 percent of greenhouse gas emissions in Europe" and can be responsible for "50 percent in some car-intensive areas in the United States," (In German Suburb, Life Goes On Without Cars). These percentages show how much humans rely on cars, which is negatively impacting countries. Greenhouse gases are extremely awful for the environment, and if they are not decreased significantly, then the Earth could become a bad place for existance. In many places, government officials have been trying to limit the percentage coming from cars, which has helped greatly. Rosenthal claimed in a different article, The End of Car Culture, that "As of April 2013, the number of miles driven per person was...equal to where the country was in January 1995." The drop of this percentage has decreased the amount of greenhouse gases in the world. Many events all over the world have contributed to the lower percentage. For example, the Car-Free Day in Bogota, Columbia has been a huge hit since the mid 1990's and is continuing to grow each year (Andrew Selsky, Car-Free Day is Spinning Into a Big Hit in Bogota). This activity along with others will continue to bring the percentage down until it is hopefully extremely small.