We’re already back above 400 parts per million of CO2 in our atmosphere.
Last year, we hit this mark in early April. This year, we are two months earlier. Given the clear trends since Keeling first started measuring atmosphere CO2 in the late 1950’s, we can expect to briefly pass below 400ppm next Fall, then pass above 400ppm late in 2015, never to fall below again.
The text below was posted a year ago, and it still applies…
Geologists are confident that, going back to at least 800,000 years ago, the CO2 in our Earth atmosphere has never exceeded 300ppm … or at least not until AFTER mankind started creating CO2 by burning coal, oil and natural gas. When measurements were started in Mauno Loa, in 1958, the annual peak for CO2 was 315ppm. As shown by the graph below, for the past week, the daily average has remained above 400ppm.
So, the pressing question is:
…when (and how) will we get control
of our addiction to fossil fuels?
- The Scripps Institution of Oceanography updates this online graph everyday.