389.47 Reasons for going solar*

There are plenty of motivations to switch from fossil fuels to solar power. Jobs. National security. Economics. Groovy technology.

CO2 Molecule

CO2 Molecule

Below, however, are what we think are the most important reasons: the 389.47 molecules of CO2 found in every million molecules of dry air — that is, once water molecules have been removed.

While we’ll continue to focus on the glories of solar power here at the Phoenix Sun, we don’t want to forget why we started this site in the first place: to urge rational stewardship for a troubled planet.

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Current chart and data for atmospheric CO2


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The Data: An explanation from CO2Now.org

The world’s most current data for atmospheric CO2 is from measurements at the Mauna Loa Observatory in Hawaii. These high-precision measurements were started by Dave Keeling in March 1958.

Dave Keeling (NASA)

Dave Keeling (NASA)

Today, the monthly average concentration of CO2 in the atmosphere is published by the National Oceanic and Atmospheric Administration (NOAA) within a week after each month ends. The source data is organized into a table and republished at CO2 Now so more people can see the latest CO2 level and the important CO2 trend. The table includes the full Mauna Loa instrument record for atmospheric CO2.

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* Updated to 390.18 ppm May, 2009.

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