Atmospheric Carbon Dioxide from Mauna Loa, Hawaii from IPY III (1957-58) to IPY IV (2007-2009)

Also known as the "Keeling Curve"

You might not know this (most people don’t,) but 2007-2008 is an International Polar Year (IPY). More than 60 countries, including the U.S., have developed large-scale polar research projects that rely heavily on international coordination and collaboration.