“In particular, the burning of fossil fuels such as coal and oil, which release carbon dioxide (CO2), the most common of the greenhouse gases after water vapor. The scientists hypothesized that adding more CO2 to the atmosphere could increase global temperatures and change climate. It was not until decades later, however, that scientific instrumentation advanced enough to determine that, in fact, atmospheric CO2 concentrations were increasing and that this was due almost entirely to human activities” (Turk, & Bensel, 2011)