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.
Help Name the Moons of Pluto!
Would you or your students like to help name the moons of Pluto? Go to http://www.plutorocks.com/ to take part in a vote - through Monday, February 25!
