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.
Icelandic Volcano Erupts!
Eyjafjallajokull, a stratovolcano in Iceland is still erupting, spewing volcanic ash that is spreading across Europe and has grounded most airline flights in Europe.
Volcanic ash is a major hazard to plane engines.
