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.
Contests
The contests listed below are for a myriad of prizes. Pay attention to the contest rules, and contact the sponsoring agency if you have any questions.
Contests for Students
Build something, create something, and write something, etc; there are contests for everyone. Check out the contest rules and prizes.
Contests for Teachers
Teachers, compete with your students, or compete with other teachers for prizes in the contests listed here.
