For many years, scientists argued that variations in carbon dioxide levels being observed were natural, and that climate change was not a problem. At some point, however, many of these same scientists began to draw a different conclusion.
Which of the following observations would have caused many scientists to conclude that climate change is occurring?
Current levels of CO 2 are higher than any observed over the last 400,000 years.
Current CO 2 level measurements are more accurate than they were 50 years ago.
Today scientists have more sophisticated computer programs for graphing CO 2 levels.
Today scientists have a better understanding of how CO 2 is distributed in the atmosphere.
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