A Realistic View of Global Warming

This essay is not embedded with non-factual giberish, instead it is a look at hard facts for and against fear of global warming.
According to the National Academy of Sciences, the Earth's surface temperature has risen by about 1 degree Fahrenheit in the past century, with accelerated warming during the past two decades. But, is this attributable to human activities? Have human activities altered the chemical composition of the atmosphere through the buildup of greenhouse gases ? primarily carbon dioxide, methane, and nitrous oxide? …