Grist: Its a tough world out there for a line chart. But, with big screen appearances in An Inconvenient Truth and PowerPoint presentations in classrooms across America, the Keeling Curve has earned its place as one of climate change`s most iconic stars.
In 1958, Charles David Keeling started collecting data on how much carbon dioxide was in the atmosphere, taking measurements at the Mauna Loa Observatory in Hawaii. After he died in 2005, the project - part of the Scripps CO2 Program - was taken over...