During the week of May 13th, the CO2 level at the Mauna Loa Observatory in Hawaii topped 400 ppm repeatedly. Daily levels of CO2 can vary due to weather, and there are seasonal trends as well.
Living During the Little Ice Age
In this lesson from the Climate Discovery Teacher's Guide, appropriate for middle school level, students compare various records to understand what life was like in Europe during the height of the Little Ice Age.
