text: Lastly, one of the advantages of limiting car usage is because of the greenhouse gas emissions. The passage states that, "President Obama's ambitious goals to curb the United States' greenhouse gas emissions, unveiled last week." Meaning that when a lot of people are using gas.                             Have you ever heard somone talk about the "Face on Mars" in books, films, tv, or haunted grocery store checkout lines? Well, in 1976, NASA discovered what looked like an Egyptian face on Mar's suface. Many have thought of this to be the work of aleins because the pictures look like there are pyramids and shacks located in the area, but NASA has proven that to be false.