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The year is 1958!  

Scientists (specifically, Dr. Charles David Keeling) first started measuring the amount of CO2 from the Mauna Loa Observatory in Hawaii in March 1958. Although his colleagues questioned why sustained monitoring was necessary, Keeling was determined to do it. 

Over the years, his research revealed what is now known as the Keeling Curve: a graph of continuously-taken measurements showing the rapid accumulation of carbon dioxide. The Mauna Loa testing continues to this day.

Want to shrink your footprint now — today — with a few simple actions? Here's a quick read to show you how.