I believe that trains are the best way to transport. They are often cheaper and run on time. They usually are not accessible for daily travel, they are mostly used for shipping. The way I travel is by bus or car. They affect the environment in the same way. Vehicle emissions can consist of carbon monoxide, which is bad for our health, and carbon dioxide, which contributes to global warming. If people could not travel, then how would we get where we needed to go? We would have to walk, which would be better for our health and global warming.