Atmospheric C[O.sub.2] reaches a record high.

• Author: Ayres, Ed
• Position: Environmental Intelligence - Brief Article

The concentration of carbon dioxide in the Earth's atmosphere last year reached its highest level in at least 420,000 years--and likely the highest in 20 million years. Measurements taken at the U.S. National Oceanic and Atmospheric Administration's Mauna Loa Observatory on Hawaii showed that C[O.sub.2] levels had risen to about 376 parts per million--an increase of 2.5 ppm from the...