Human society has relied on fossil fuels, such as oil and coal, for many generations -- and we will probably rely on them for quite a while to come. As many have observed, this is not necessarily a good thing.
The fossil-fuel economy is the standard gasoline-burning world we're used to. But it has some serious downsides to it. Cars powered by the internal combustion engine produce byproducts that are bad for the air, like carbon monoxide, nitrogen oxides and unburned hydrocarbons. Along similar pollution lines, the fossil-fuel economy is also responsible for a good portion of global warming. Each gallon of gas your car burns emits 5 pounds (2.3 kilograms) of carbon, which contributes to the rising temperature of the atmosphere. Meanwhile, the transportation of the oil used to produce gasoline is often at fault for major environmental pollution problems: Think oil tanker spills, pipeline explosions and well fires. Finally, on the political end of the spectrum, the fossil-fuel economy forces the United States to be dependent on oil-rich countries, as we can't produce enough of our own oil. That has all kinds of repercussions, including allowing other countries to control how much we pay for gas.
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