text: Let us begin with the most pressing issue: preserving the environment. Studies have shown that nearly "12 percent of greenhouse gas emissions in Europe...and up to 50 percent in some car intensive areas in the United States." come from passenger cars (Rosenthal 1, 5). Reducing these greenhouse gases, which pose a threat to the Earth's atmosphere, would be an improvement, although slow, still an improvement nonetheless. While this would not be the immmediately noticable of changes, making an effort to cleanse our cities of pollution would be.