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.
The Earth Scientist, Volume XXV, Issue 3, Summer 2007

$10.00
Articles in the Summer 2007 issue of The Earth Scientist include:
- Earth Sciences & Sustainability, by Peggy Green,
- The Biosphere: An Integral Part of the Planet
and its Climate, by Lisa Gardiner - Earth Science Week, by Geoff Camphire
- EarthStorm -Climatology, by Andrea Melvin
- Earth Science is Real Life, by Bonnie Keller
- Weather : Open the Windows, by WeatherBug Schools Program
- Earthlearning Ideas across the Globe, by Chris King, Peter Kennett and Elizabeth Devon
Price: $10.00
