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.
NSTA ExploraVision
Designed for K–12 students of all interest, skill and ability levels, ExploraVision encourages kids to create and explore a vision of future technology by combining their imaginations with the tools of science. All inventions and innovations result from creative thinking and problem solving. That's what ExploraVision is all about. ExploraVision prizes include: First Prize (4 teams): U.S. EE Savings Bond worth $10,000* at maturity for each student; Second Prize (4 teams): U.S. EE Savings Bond worth $5,000* at maturity for each student. Deadline: 2 February 2011
