text: The struggle for clean air is even in our own back yard. President Obama has even addressed it himself last week as it came out that Americans are buying less cars and driving the ones they already have less. Now this may sound a bit astounding considering that Americans have a passion for cars. In Detroit,, Michigan, companies who are internationally known for their cars have their base of operations lacted in the sprawlng urban playground. The first mass produced automobile, the Ford Model-T, was even crafted right here in the United States! However,  there is still a noticeable decline in the use of cars in American lives. This isn't all bad though, some of Americas cities are falling into a danger that other cities across the globe have already fallen for; smog and greenhouse gas pollution.